Sifts Review: The Chitosan 'Microplastic Support' Supplement, the Two Small Studies Behind It and the Fine Print in Its 60-Day Guarantee

Our verdict

It depends on how much you want to bet on early science. Sifts is a two-capsule chitosan and fibre supplement sold as microplastic support, and the idea is grounded: two small human studies found chitosan raised microplastics in stool and lowered blood levels by 26.3%. But those studies used crayfish chitosan at 0.8 g a day, while Sifts uses crab and shrimp chitosan at an undisclosed dose, and its "60-day" guarantee needs notice within 30 days. Sifts scores 3.8 out of 10, held back by the gap between the studies and the product.

The short version

• What it is: a daily capsule of chitosan, apple pectin, baobab and slippery elm, sold as gut and elimination support for microplastics.
• Price: $65 for a one-off month on 4 October 2026, or $42 to $49 a month on autoship.
• Best trait: a simple fibre formula built around the one ingredient with any human microplastic data.
• Biggest drawback: the chitosan dose is hidden, and the product itself has not been studied.
• Our score: 3.8 out of 10.

Pros & cons

The pros come from the ingredient choice and packaging. The cons are about the evidence gap, the label and the refund terms.

How it works

Microplastics are plastic fragments smaller than 5 millimetres, and they reach us through food, water and air. Sifts is built on chitosan, a fibre made from the shells of crustaceans. Chitosan carries a positive electrical charge, and many microplastic particles carry a negative one, so the theory is that chitosan clings to particles in the gut and carries them out in stool before they can be absorbed.

Alongside chitosan, the formula adds apple pectin, a soluble fibre, plus baobab fruit extract and slippery elm, which the brand describes as prebiotic and soothing fibres. Two capsules a day is one serving, and a jar lasts 30 days.

1. 01

   Take two capsules a day

   Step 1: Swallow two capsules with water, usually with a meal, according to the brand. One jar holds 30 servings.

2. 02

   Fibres meet particles in the gut

   Step 2: Chitosan carries a positive charge, and the brand says it can attract negatively charged microplastic particles in the digestive tract alongside the other fibres.

3. 03

   Bound particles leave in stool

   Step 3: The idea is that particles held by the fibre pass out in stool instead of being absorbed. Small studies of chitosan support this; Sifts itself has not been tested.

Why chitosan

Chitosan has been sold for years as a "fat binder" for weight loss, with weak results. Its newer use comes from lab and animal work showing it can bind small particles, followed by two small human studies in 2025 and 2026. Those studies are why several microplastic supplements now lead with chitosan.

What the other ingredients do

Apple pectin is a soluble fibre that forms a gel in the gut, and some lab research suggests pectins can also trap particles. Baobab fruit is rich in fibre and polyphenols. Slippery elm forms a slippery mucilage that is used for digestive comfort. Magnesium glycinate at 12 mg is a token amount, 3% of the daily value.

Magnesium and the label

The 12 mg of magnesium glycinate is a small extra, about 3% of the daily value. It is too little to matter for most people, but worth counting if you already take a magnesium supplement. The label does not explain why it is included.

The capsule shell

The page does not say whether the capsules are gelatin or plant-based. If you avoid animal products for reasons other than shellfish, ask the brand, though the chitosan itself already comes from crustaceans.

Where the theory stops

Binding particles in the gut could only affect plastic you swallow, and only the share that has not already been absorbed. It cannot reach particles you breathe in, and no study has shown that it removes plastic already stored in organs. The 2026 blood study suggests some knock-on effect on circulating particles, but it was small and short.

What the brand's mechanism graphic says

The product page describes three steps: bind, buffer and protect. Chitosan binds particles, the prebiotic fibres support the gut environment, and the fibre matrix helps bound particles leave through normal digestion. It is a clear explanation of the theory. Each step is described with "supports" language and the FDA disclaimer, which is the standard way supplements phrase claims they have not proved.

Why the charge matters

Plastics such as polyethylene and polystyrene often carry a slight negative surface charge in the gut, especially once they pick up a coating of proteins and other molecules. Chitosan's positive charge depends on acidity: it is strongly charged in the acidic stomach and less so in the more neutral small intestine. That is one reason lab results may not translate simply to the whole gut.

What the capsule cannot do

Fibre in the gut can only meet particles that are in the gut. Microplastics you breathe in, which some research suggests may be a major route indoors, never pass through the digestive tract at all. Particles already absorbed and stored in tissue are also out of reach of anything in the gut.

Who it's for

Sifts suits people who are worried about microplastics, accept that the evidence is early, and want a low-risk fibre supplement in plastic-free packaging. It suits people who will manage a subscription carefully. It does not suit anyone with a shellfish allergy, people on blood thinners or other critical medicines without medical advice, or buyers who want a product with its own clinical trial.

• People worried about microplastics who want to try a low-risk fibre supplement while the science develops
• Anyone already looking for a fibre supplement who likes plastic-free packaging
• Buyers comfortable with a subscription they will remember to manage

Why Sifts appeals

Microplastic headlines are hard to ignore: particles have been found in human blood, lungs and placentas, and almost every meal and drink contains some. Most advice, such as using glass and filtering water, feels like small steps against a huge problem. A daily capsule that claims to help the body remove what you cannot avoid is a reassuring idea, and Sifts presents it with citations, a physician advisor and calm, clean packaging.

People already cutting plastic exposure

If you already filter your water, avoid heating food in plastic and use glass containers, Sifts may feel like the next step. In our view, those habits are still the better-evidenced part of reducing exposure, and a supplement should sit alongside them, not replace them.

Parents thinking about family exposure

Parents often worry about plastic in baby bottles, food containers and toys. Sifts is labelled for adults and gives no guidance for children. For families, practical steps such as glass bottles, not heating milk in plastic and filtering water are the safer route.

Fibre seekers

Most adults eat less fibre than recommended. Sifts adds a little soluble fibre each day, though two capsules hold about a gram, far less than a portion of oats or beans. If more fibre is your main goal, food does it better and more cheaply.

Biohackers and longevity followers

Microplastics have become a topic in longevity circles, and Sifts targets that audience. If you track biomarkers, note that microplastic blood testing is still a research method, not a routine lab test, so you are unlikely to be able to measure any effect yourself.

People with digestive conditions

People with irritable bowel syndrome, inflammatory bowel disease or a history of bowel obstruction should be careful with new fibre supplements. Chitosan can thicken stool, and some fibres worsen bloating in sensitive guts. Ask your gastroenterologist or GP before starting.

Older adults

Older people are more likely to take several medicines and to be at risk of constipation. Both make a binder supplement worth discussing with a pharmacist first. Spacing it away from medicines matters more when you take several each day.

People on a tight budget

At $42 to $65 a month, Sifts is a significant ongoing cost for an unproven benefit. If budget matters, a water filter is a one-off cost that reduces exposure every day, and food-based fibre costs very little.

Who should skip it

Skip Sifts if you have a shellfish allergy: the label says it contains crab and shrimp. Skip it, or ask a doctor first, if you take warfarin, other blood thinners, or medicines and vitamins that need steady absorption. Skip it if you are pregnant, breastfeeding or buying for a child. And skip it if you want a product tested as a finished formula.

• Anyone with a shellfish allergy
• People taking warfarin or other blood thinners, or medicines that need steady absorption, without a doctor's advice
• Pregnant or breastfeeding people, and children
• Buyers who want a supplement tested as a finished product

Does Sifts actually work? What the studies show

Nobody has tested Sifts itself, but its main ingredient has early human data. In a 2026 pilot study, 11 adults took crayfish chitosan at 0.8 g a day for 15 days and their blood microplastic levels fell 26.3%, while 10 controls saw no significant change. In a 2025 crossover study, 10 volunteers excreted more microplastics after one meal with the same chitosan. Both are small, and neither used the Sifts formula.

The blood study

The 2026 pilot study in the Journal of Xenobiotics gave chitosan from the crayfish Procambarus clarkii at 0.8 g a day. Average blood microplastic concentration fell from 1.84 to 1.34 micrograms per millilitre. The authors call it "preliminary evidence", and with 21 people over 15 days, it cannot show whether the change lasts or matters for health.

The stool study

The 2025 Foods study asked 10 healthy volunteers to eat a standard meal twice, once without and once with 0.8 g of the same crayfish chitosan. Average particles counted in stool rose from 656 to 965, which is where the brand's "47% more excreted" figure comes from. The authors say further controlled studies are needed.

The animal study

The third study Sifts cites, a 2025 paper in Scientific Reports, found chitosan increased excretion of ingested microplastics in animals. Animal results often do not carry over to people, so it adds plausibility rather than proof.

The dose question

Both human studies used 0.8 g of chitosan a day. Sifts puts chitosan and apple pectin together in a 950 mg "binder blend" and does not say how much of each is inside. If chitosan made up most of the blend, the dose could be close to the studied amount. If pectin made up a large share, it would be lower.

What to do: email the brand and ask for the chitosan amount per serving before you buy.

The source question

The studies used chitosan from crayfish, prepared in a specific way. Sifts' allergen note says its chitosan comes from crab and shrimp. Chitosan from different sources can differ in charge density and particle size, which could affect how well it binds. Nobody has tested whether crab and shrimp chitosan behaves the same way for microplastics.

Who funded and ran the studies

Both human studies share an author, Umberto Cornelli of Loyola University, and both studied the same crayfish-derived chitosan. The papers declare no competing interests. Independent replication by other groups, with larger samples and longer follow-up, would make the findings far stronger. Until then, they are a promising signal rather than settled science.

How microplastics were measured

The blood study measured particles with microscopes and infrared spectroscopy, which identify plastic types by their chemical fingerprint. These methods are demanding, and contamination from lab air and equipment is a known challenge in microplastic research. Small studies are especially sensitive to measurement error.

Does lowering microplastics help health?

This is the biggest open question. Researchers are still working out what microplastics in the body do. The World Health Organization's 2019 review of microplastics in drinking water found too little evidence to judge the health risk and called for more research. Even if Sifts lowered your levels, no study yet shows that you would feel or be any different.

What this means for you: treat Sifts as an experiment on early evidence, not a proven protection.

Are Sifts' marketing claims accurate?

Mostly carefully worded, with a few stretches. The page says Sifts uses "clinically-studied ingredients", which is true of chitosan, and carries the standard FDA supplement disclaimer. But "FDA-audited facility" can read like approval, the study figures come from a different chitosan at a known dose, and the "60-Day Money-Back Guarantee" headline hides a 30-day notice deadline, a $5 fee and a one-order limit.

"Clinically-Studied Ingredients"

Chitosan has been studied, and the brand links to the papers, which is more than many supplements do. The wording describes the ingredients, not the product, and the page is clear about that in small print. A reader skimming the 47% and 26% figures could easily assume they describe Sifts.

"FDA-Audited Facility" and "Third-Party Tested"

The claims graphic shows badges for an FDA-audited facility, cGMP compliance and ISO 17025 third-party lab testing. Supplement makers must follow the FDA's good manufacturing rules, and facilities can be inspected. That is not the same as FDA approval, which supplements do not receive. The brand does not publish its third-party test certificates on the product page.

What to do: ask for a recent certificate of analysis, including heavy metal testing, which matters for shellfish-derived ingredients.

"Physician Reviewed"

The brand names a lead clinical advisor, a cardiologist with NIH research experience. An advisor reviewing a formula is common in the supplement industry and does not replace a clinical trial of the product.

"Promotes regularity"

Fibre supplements commonly help regularity. With about a gram of mixed fibre a day, the effect is likely to be mild for most people, and chitosan can also cause constipation in some.

"Plastic-free, amber glass"

This claim checks out from the photos: the jar is amber glass, and refills come in a kraft-style pouch. Whether the pouch is fully plastic-free is not stated; many paper-look pouches have a thin plastic lining. Ask the brand if that matters to you.

The comparison table on the page

Sifts compares itself with activated charcoal and with "food swaps alone". It is fair that charcoal binds nutrients and medicines and is not meant for daily use. The table's "no binding mechanism" for food swaps misses the point that food swaps reduce intake in the first place, which is the better-evidenced step.

Customer reviews

The product page shows a 4.9 rating from 239 reviews on its own site. On Trustpilot, on 4 October 2026, Sifts had a claimed profile with no reviews at all. Reviews collected by a brand on its own page are not independent, so we do not count them in our score.

How much does Sifts cost, and how does the subscription work?

On 4 October 2026, a one-off 30-day jar of Sifts cost $65. Autoship cost $49 every four weeks for one jar, $90 every eight weeks for two or $126 every twelve weeks for three, so $42 to $49 a month. The first order shipped free with a refill jar and a "Plastic-Lite" guide. Over a year on the cheapest plan, Sifts costs about $546.

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  The Sifts Supplement Facts panel

• 

  Sifts capsules beside the jar

Sifts price and plans

The page shows $65 crossed out next to each autoship price, which is the one-off price rather than an inflated reference.

Four-week billing

Autoship bills every four weeks, not every calendar month, so there are 13 billing cycles a year rather than 12. On the one-jar plan, that is $637 a year.

The one-off option

The $65 one-off month is the safest way to try Sifts, because it does not start a subscription. It costs $16 more than the first autoship month, which is a reasonable price for avoiding renewals while you decide.

Pausing and cancelling

The page says you can pause or cancel anytime. It does not say how far ahead of the next billing date you must cancel. Check your account or confirmation email for the cut-off.

What to do: set a calendar reminder a few days before each billing date for the first few months.

What chitosan alone costs

Plain chitosan capsules are widely sold for well under $20 a bottle, usually as a weight-loss aid. They are not formulated or tested for microplastics, and their chitosan source and quality vary. Sifts' extra cost covers the added fibres, the glass packaging and the brand's testing claims.

The free gifts

First orders include a refillable glass jar and a "Plastic-Lite" guide, valued on the page at $34. The jar is useful for decanting refill pouches. The guide is the practical part of reducing exposure, and much of that advice is also free from public health bodies.

Cost per year compared

A year on the cheapest three-month plan costs about $546. A year on the four-weekly one-jar plan costs about $637. A good under-sink carbon block water filter often costs less than either and lasts years with cartridge changes, reducing microplastics in the water you drink and cook with every day.

Shipping

The first order ships free, according to the page. It does not state shipping charges for later one-off orders, and original shipping is non-refundable under the refund policy.

Who sells it

Sifts is sold by Gevy Labs LLC, according to its refund policy, which lists a returns address at 2570 W Success Way, Emmett, Idaho. Support is by email at the address on the brand's contact page.

Is Sifts better than a plain fibre supplement or cutting plastic exposure?

For lowering microplastics, cutting exposure has firmer logic; for fibre, food and plain psyllium cost far less. Sifts' advantage is chitosan, the only ingredient with human microplastic data, packaged for daily use. If you want to try chitosan for that purpose, Sifts is a tidy way to do it. If you only want gut support, a basic fibre supplement or more vegetables, beans and oats do more for less.

Sifts vs plain chitosan

Basic chitosan supplements contain the same type of ingredient at known doses, often 500 mg or more per capsule, and cost much less. They are usually marketed for weight loss and come in plastic bottles. Their source and processing vary, and none has been tested for microplastics either. Sifts adds fibre, glass packaging and testing claims.

Sifts vs psyllium and dietary fibre

Psyllium husk is the most studied fibre supplement for regularity and cholesterol, and a typical daily dose has several times more fibre than two Sifts capsules. It has no microplastic data. For gut health alone, it is the stronger and cheaper choice.

Sifts vs water filters

Bottled and tap water both carry microplastics, and studies have found high particle counts in some bottled water. Filters with fine carbon blocks or reverse osmosis membranes remove a large share of particles. For a household, a filter is likely to make a bigger and more certain difference than a supplement.

Sifts vs reducing exposure

Practical steps such as filtering drinking water, not microwaving food in plastic, choosing glass or steel bottles and vacuuming dust regularly reduce what you take in. They cost little and do not depend on unproven binding. In our view, they should come first.

Sifts vs other gut supplements we have reviewed

Our Emma Relief review looks at a gut supplement built around digestive comfort, our Akka review covers a liver support formula, and our Cloud9 Daily Restore review examines a supplement for drinkers. Each shows how thin evidence for a finished formula often is.

Sifts vs other microplastic supplements

Several brands now sell chitosan-based microplastic supplements, and most cite the same small studies. When comparing them, look for the chitosan dose per serving, the chitosan source, published test certificates and refund terms. A brand that discloses the exact chitosan amount gives you more to judge than one that uses a proprietary blend.

When Sifts makes sense

If you have decided to try chitosan for microplastics, have no shellfish allergy, take no interacting medicines and like the plastic-free packaging, Sifts is a reasonable way to do it, provided the brand tells you the chitosan dose.

Is Sifts legit, and what should you check before buying?

Sifts is a real supplement from Gevy Labs LLC, its cited studies exist on PubMed, and it carries the required FDA disclaimer. The things to check are the hidden chitosan dose, the shellfish allergen, medicine interactions and the refund rules: you must email within 30 days of delivery, return the jar within 60 days at your cost, pay a $5 restocking fee, and only one order per customer is refundable.

The refund terms in full

According to the refund policy, to use the 60-Day Satisfaction Guarantee you must email support within 30 days of delivery, then post the product back within 60 days. Returns must include the original glass jar, though empty or partly used jars are accepted. You pay return postage, original shipping is not refunded, a $5 restocking fee is deducted, and refunds are limited to one order per customer. Refunds take 7 to 10 business days after processing.

What to do: if you are unsure after a few weeks, email support before day 30 even if you are still deciding.

Keep your order details

Keep your order confirmation, delivery date and the glass jar. The 30-day notice window counts from delivery, so the delivery date matters if you later claim the guarantee.

Shellfish allergy

The label says Sifts contains crab and shrimp. People with shellfish allergies should not take it.

Medicines and nutrients

A case report in the Annals of Pharmacotherapy linked chitosan to a sharply raised INR, a measure of blood clotting, in a patient taking warfarin. Chitosan may also reduce absorption of fat-soluble vitamins and some medicines. If you take regular medicines, ask your doctor or pharmacist before starting.

What to do: take Sifts at a different time from medicines and vitamin supplements, as your pharmacist advises.

Ask before combining binders

If you already take other binders, such as activated charcoal, bentonite clay or cholesterol-lowering resins, ask a pharmacist before adding chitosan. Stacking binders raises the chance of constipation and of reducing nutrient and medicine absorption.

Side effects

Chitosan is generally well tolerated short term. Reported side effects include bloating, constipation, wind and nausea. Start with the recommended dose and drink enough water.

Allergic reactions

Signs of an allergic reaction include itching, hives, swelling of the lips or throat and difficulty breathing. Anyone with a known shellfish allergy should not take Sifts. If you notice any reaction, stop taking it and seek medical help straight away.

Subscription management

Autoship bills every four weeks. Make sure you know how to pause or cancel in your account before the first renewal.

Quality and contamination

Shellfish-derived ingredients can carry heavy metals if not properly sourced and purified. The brand says Sifts is third-party tested, which is the right step. Seeing a certificate of analysis with heavy metal results would confirm it.

Pregnancy and children

There is no safety research on chitosan supplements for microplastics in pregnancy, breastfeeding or children. The cautious choice is to avoid it in those groups and focus on reducing exposure.

How to buy Sifts the smart way

1. Email the brand to ask for the chitosan amount per serving and a recent test certificate.
2. Check with your doctor if you take medicines or have a shellfish allergy.
3. Open the Sifts product page (opens Sifts (Gevy Labs LLC) in a new tab) and choose a one-off month or autoship.
4. If you choose autoship, note the next billing date and how to pause.
5. Keep the glass jar and decide within 30 days of delivery whether to claim the guarantee.

How did we score Sifts?

Sifts scores 3.8 out of 10: claim accuracy 0.7, product quality 1.0, price competitiveness 0.5, usability 1.2 and owner satisfaction 0.4, each out of 2. The ingredient choice is grounded in real studies and the page is more careful than most, but the product itself is untested, the chitosan dose is hidden, the source differs from the studies, the price is high for a gram of fibre, and the guarantee is narrower than its headline.

What owners say

On Trustpilot, Sifts had a claimed profile with no reviews on 4 October 2026. The 4.9-star rating on the brand's own page comes from reviews the brand collects. The top-ranking pages about Sifts are mostly promotional or press releases.

How the score breaks down

We use the five criteria on our how we test page, each out of 2. For supplements, "build durability" covers formula quality and transparency.

What we did, and did not, do

Nobody on our team has taken Sifts. We read the product page, Shopify product data, label and refund policy on 4 October 2026, read the three studies the brand cites on PubMed, checked Trustpilot, and read published reports on chitosan safety. Our supplements hub lists the other supplements we have reviewed.

How to use Sifts sensibly

Take two Sifts capsules a day with water and a meal, a couple of hours apart from any medicines or vitamins, and give it a month while you also cut obvious plastic exposure. Drink enough water, watch for bloating or constipation in the first week, and decide before day 30 whether you want to claim the guarantee. Do not take more than the label says.

1. Check with your doctor first if you take medicines.
2. Take two capsules with a meal. Food is when you swallow most microplastics.
3. Space it from medicines. A couple of hours apart, or as your pharmacist advises.
4. Drink water. Fibre works best with fluid.
5. Cut exposure too. Filter water and stop heating food in plastic.
6. Note how you feel. Track digestion for the first two weeks.
7. Decide by day 30. Email support if you want to return it.

Timing with coffee

Some customers on the product page say they take the capsules with morning coffee. Coffee itself is fine, but if breakfast is small, taking Sifts with a larger meal later in the day may suit the brand's own mechanism better. Hot drinks from plastic-lined cups and lids are also a known source of microplastic contact.

Tracking whether it suits you

You cannot measure microplastics at home, so judge the supplement on what you can notice: digestion, regularity and how easily it fits your routine. If you notice nothing either way after a month, decide whether paying for an unmeasurable benefit is worth it to you.

Choosing the meal

The brand's mechanism relies on the fibre being in your gut at the same time as the particles you swallow. Taking it with your largest meal of the day, or with food you suspect has more plastic contact, such as takeaway in plastic containers, fits that logic.

If you get side effects

Mild bloating usually settles within a week as your gut adjusts to extra fibre. Constipation is more likely with chitosan if you do not drink enough. If symptoms persist, stop and speak to a pharmacist.

Travelling with it

The glass jar is heavy and breakable for travel. Decanting a week's capsules into a small paper envelope or metal tin keeps the plastic-free idea while protecting the jar at home. Keep capsules dry and away from heat.

Giving it a fair trial

A month is enough to see whether Sifts agrees with your digestion and fits your routine. It is not enough to judge any effect on microplastics, which you cannot measure. Decide on the first point within the 30-day notice window, and treat the second as unknown.

Refills and storage

Refill pouches go into the glass jar. Keep it closed, in a cool, dry place away from steam, which can soften capsules.

Cutting plastic at home

The most useful changes are simple: use a carbon block or reverse osmosis filter for drinking water, avoid microwaving in plastic, store hot food in glass, swap plastic chopping boards for wood, and vacuum and dust regularly, since household dust carries fibres from synthetic fabrics.

Other questions about microplastic supplements

Can I take Sifts with probiotics? Generally yes, but space it from other supplements as your pharmacist advises.

Does activated charcoal remove microplastics? There is little evidence, and charcoal binds nutrients and medicines, so it is not suited to daily use.

Will Sifts help me lose weight? It is not sold for weight loss, and chitosan's weight-loss effect in studies has been small.

How long should I take it? The blood study lasted 15 days. There is no evidence on long-term use for microplastics.

More questions about microplastics and supplements

How do microplastics get into the body? Mainly through food and drink, especially water, salt, seafood and food stored or heated in plastic, and through breathing indoor dust and fibres from synthetic fabrics.

Can you test for microplastics in your body? Research labs measure them in blood, stool and tissue with specialist microscopes and spectroscopy. These tests are not routine, and consumer tests are not yet standardised.

Is chitosan vegan? No. Most chitosan comes from crustacean shells. Some fungal chitosan exists, but Sifts' label says its chitosan comes from crab and shrimp.

Does cooking or diet affect microplastic intake? Diets heavy in packaged, processed and takeaway foods are thought to carry more microplastic contact. Fresh food stored in glass or steel reduces it.

Frequently asked questions