Supplement reviews that check the label, the evidence and the refund terms

Saw a supplement in an online ad? Before you order, we read its Supplement Facts panel, compare every dose with the human research, and read the refund policy line by line. No star ratings, no fake testimonials.

Doses checked against studiesRefund terms read in fullEvery fact citedAffiliate links disclosed

Our method

Every review answers four questions

Read our full method
1What is actually in it?Every ingredient and dose from the Supplement Facts panel, and whether a proprietary blend hides the amounts.
2Do those doses match the research?Each dose against the amounts used in human studies, from NIH, NCCIH and PubMed sources.
3Who should skip it?Side effects, drug interactions and who should ask a doctor or pharmacist first.
4What will it really cost?Real package prices, shipping, upsells, auto-ship and how the refund works.

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Buyer checklist

Before you order a supplement you saw in an ad

Six checks that take ten minutes and can save you the price of a six-bottle bundle.

1

Find the full label before checkout

Many sales pages show a bottle but not the Supplement Facts panel. Find it before you pay. It lists each active ingredient, the amount per serving, and the other ingredients such as fillers, binders and flavorings.

2

Work out the real price per bottle

Bundles of three or six bottles look cheaper next to a crossed-out price. Add shipping, divide by the number of bottles, then by the days each bottle lasts. Compare that daily cost with the single bottle.

3

Check for auto-ship or a subscription

Look for the words subscription, auto-ship or member price. The terms should say what you agree to, how long any trial lasts, and how and when to cancel. If you cannot find them, the FTC says do not sign up.

4

Learn when the refund clock starts

Read whether the refund window counts from the order date or the delivery date. ClickBank says most products sold through it have a sixty day refund period, and the refund button disappears once that period ends.

5

Ask who pays return shipping

The FTC tells shoppers to check who pays return shipping, how many days you have, and whether there is a restocking fee. ClickBank says buyers of physical products must follow the seller's return policy, including shipping costs where they apply.

6

Read every page after you pay

Many offers show extra pages after checkout that sell more bottles or add-ons. Read each button before you click it. The FTC warns that a pre-checked box can sign you up for more products you must pay for.

Label decoder

How do you read a Supplement Facts label?

Every supplement sold in the US carries this panel. Six parts tell you most of what you need before you buy.

How to read a Supplement Facts label A sample Supplement Facts panel for a metabolism capsule with six numbered parts: serving size, amount per serving, a proprietary blend that hides doses, other ingredients, the FDA disclaimer and a quality seal. Supplement Facts Serving Size: 2 Capsules Servings Per Container: 30 Amount Per Serving % Daily Value Chromium (as picolinate) 200 mcg571% Green tea extract (leaf) 250 mg* Metabolic Support Blend 480 mg* Garcinia fruit, raspberry ketone, ginger root, cayenne (individual amounts not listed) * Daily Value not established. Other ingredients: vegetable cellulose capsule, rice flour, silicon dioxide. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. THIRD-PARTY TESTED 1 2 3 4 5 6
Sample label for illustration. Numbers match the notes.
  1. 1
    Serving size

    One serving is the most the label recommends per occasion. If the directions say take 1 to 3 capsules, the serving is 3 capsules. Check how many servings the bottle holds.

  2. 2
    Amount per serving

    Each active ingredient appears with its amount per serving. This is the dose. Compare it with the dose used in research, not with the promises on the sales page.

  3. 3
    Proprietary blend

    A blend must show its total weight and list its ingredients in order of weight. It does not show how much of each one is inside, so single doses cannot be checked.

  4. 4
    Other ingredients

    This line covers fillers, binders, flavorings and similar inactive parts of the product. Read it closely if you have food allergies or avoid certain ingredients.

  5. 5
    The FDA disclaimer

    A claim such as supports joint health must carry a statement that the FDA has not evaluated it and that the product is not meant to diagnose, treat, cure or prevent disease.

  6. 6
    Quality seals

    USP, NSF International and ConsumerLab.com test products for proper manufacture, label accuracy and harmful contaminants. A seal does not mean safe or effective. Words like verified alone guarantee nothing.

Evidence snapshot

What does the research say about ingredients common in online ads?

Grades describe the human evidence for the use each ingredient is sold for, not whether a product works.

IngredientOften sold forWhat the research showsEvidence
Green tea extractWeight loss, cholesterolCatechins and caffeine may have a modest effect on body weight. Extract pills have been linked to liver injury in some people. Source: NCCIH: Green TeaLimited
Garcinia cambogiaAppetite control, fat lossLittle to no effect on weight loss. It can cause headache, nausea and stomach symptoms. Source: NIH ODS: Dietary Supplements for Weight LossWeak
Raspberry ketoneFat burningOnly studied mixed with other ingredients, never alone. Its effect on weight is unknown and its safety has not been studied enough. Source: NIH ODS: Dietary Supplements for Weight LossWeak
GlucomannanFeeling full, weight lossLittle to no effect on weight loss. It might help lower cholesterol and blood sugar. It can cause gas and loose stools. Source: NIH ODS: Dietary Supplements for Weight LossWeak
AshwagandhaStress, anxiety, sleepSeveral studies of 6 to 8 weeks found less reported stress and anxiety. Sleep benefits were small. Safety beyond about 3 months is unclear. Source: NIH ODS: AshwagandhaModerate
Turmeric (curcumin)Joint pain, inflammationEarly evidence for knee osteoarthritis is positive but not definitive. High-absorption curcumin products have been linked to liver damage. Source: NCCIH: TurmericLimited
GinkgoMemory, brain healthNot shown to work for any condition studied. In a study of over 3,000 older adults it did not lower dementia rates. Source: NCCIH: GinkgoWeak
Saw palmettoProstate and urinary symptomsA 2023 review of 27 studies found little or no benefit for enlarged prostate symptoms when taken alone. It is well tolerated. Source: NCCIH: Saw PalmettoWeak

Red flags

Six warning signs on a supplement sales page

We look for each of these on every product page we review, and we tell you when we find one.

Countdown timers and "only 3 left"

Timers and stock counters push you to buy before you read the terms. The FTC warns that some online ads are made to get your click, not to tell you the truth about the offer. FTC: Free Trials, Auto-Renewals and Negative Option Subscriptions (archived copy)

"FDA approved" badges

Supplements do not need FDA approval before they are sold. The FTC tells advertisers not to imply FDA approval, and following the label disclaimer rules is not FDA authorization either. FTC Health Products Compliance Guidance

Promises to cure a disease

Only drugs may claim to treat, cure or prevent a disease. The FDA says products sold on unproven cure claims waste money and can delay a proper diagnosis and treatment. FDA: Health Fraud Scams

Before and after photos, doctor endorsements

Advertisers are liable for misleading endorsements. The FTC says a dramatic testimonial with "results not typical" in fine print is still deceptive unless typical results are clearly disclosed. FTC Health Products Compliance Guidance

A long video and no label

If the only way to learn the ingredients is to sit through a long video, the page is hiding what matters. Every supplement has a Supplement Facts label, so ask to see it first. NIH Office of Dietary Supplements

A "free bottle" that starts auto-ship

Free offers usually take your card so the seller can charge you if you do not cancel in time. The FTC says that if you must pay shipping to get it, it is not really free. FTC: Free Trials, Auto-Renewals and Negative Option Subscriptions (archived copy)

Refund playbook

How to get your money back on an online supplement order

  1. Save the offer and the checkout

    Screenshot the sales page, the price, the refund terms and the order confirmation. The FTC tells online shoppers to keep receipts, emails and card statements so they can hold a seller to its promises.

  2. Note the order number and the statement name

    ClickBank orders show as CLKBANK* on your statement. To find an order you need the email you used plus the order number or the last four digits of your card.

  3. Put the deadline on your calendar

    ClickBank says most of its products have a sixty day refund period. After that the refund button is gone and you have to contact the seller directly by email or phone.

  4. Ask the retailer first

    For ClickBank orders, look up the order at CLKBank.com and open a refund ticket. For physical products, follow the seller's return policy, which may mean returning the items and paying shipping.

  5. Dispute the charge as a last resort

    Billed for goods you never got, or sent the wrong item? You can dispute the charge. The FTC says your letter must reach the issuer within 60 days of the first bill showing the error.

Safety first

Who should ask a clinician before taking any supplement?

  • Anyone pregnant, trying to conceive or breastfeedingMany supplements have never been tested in pregnant or nursing women. Some herbs sold in online ads, including ashwagandha and saw palmetto, may be unsafe during pregnancy.
  • Parents buying for a childMost supplements have not been well tested in children. Give one only when your child's own health care provider recommends it.
  • People on prescription medicineSupplements can change how drugs work. St. John's wort weakens many medicines, and green tea extract can lower blood levels of the cholesterol drug atorvastatin.
  • Anyone with surgery coming upSome supplements raise bleeding risk or change your response to anesthesia. Tell your surgical team about every product you take, as early as you can.
  • People managing a long-term conditionA supplement can cause harm if you have certain medical problems. Get your provider's approval before using one in place of, or alongside, a prescribed treatment.

Myths

Five supplement myths that sales pages rely on

MythNatural means it cannot hurt you.

FactKava and comfrey are both natural, and both can damage the liver. Safety depends on the chemical makeup, how the product is prepared and how much you take.

MythA money-back guarantee proves the product works.

FactA guarantee is a sales term, not evidence. The FDA does not decide whether a supplement works before it is sold, and the refund only helps if you claim it in time.

MythA long list of studies means it is proven.

FactThe product in the bottle may differ from what was tested. One review of 27 popular immune ingredients found rigorous human studies for only eight of them.

MythThe biggest bundle always saves money.

FactIt only saves money if you finish every bottle. If you want a refund, a physical-product return can mean sending items back and paying the shipping yourself.

MythReviews on the sales page are independent.

FactThe seller picks them. The FTC notes that some reviewers are paid without saying so, and that affiliates who promote offers are paid when you click.

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Why read us

Written for buyers, not for brands

No scores, no starsWe do not boil a product down to a number. You see each ingredient, its evidence grade and the offer terms side by side.
Every dose checkedWe compare the amount per serving on the label with the dose used in the research. Proprietary blends that hide doses are called out.
Refund terms read in fullWe read the refund window, return shipping rules and auto-ship terms before we write a word, and we put them near the top.
Affiliate links disclosedPages with affiliate links say so. A commission never changes the evidence grades, the price math or the red flags we report.
Daniel Brooks

Meet the editor

Daniel Brooks, Reviews Editor, ProveNutra

Daniel Brooks is the Reviews Editor at ProveNutra. He reads every supplement facts panel line by line, checks each ingredient and dose against human research from the NIH Office of Dietary Supplements, NCCIH, PubMed and the Cochrane Library, and reads the refund policy and checkout terms before a review is published. Daniel is not a doctor, dietitian or pharmacist, and his reviews are not medical advice. He writes pros, cons and who a product suits, never scores.

  • The full Supplement Facts panel and serving size
  • Each dose against the amount used in research
  • Proprietary blends that hide single doses
  • Price per bottle and per day across every bundle
Read Daniel's profile and reviews

Questions

Frequently asked questions about ProveNutra

Is ProveNutra medical advice?

No. We explain labels, prices, refund terms and published research so you can make a better buying decision. We are not doctors, and nothing here replaces advice from your own health care provider, especially if you take medicine or have a health condition.

How does ProveNutra make money?

Some links on our reviews are affiliate links. If you buy through one, the seller may pay us a commission. Every page that carries these links says so near the top, and a commission never changes the grade, the price math or the risks we report.

Do you accept free products from brands?

No. We do not accept free bottles, samples or payment for coverage from any supplement seller. Brands cannot pay to be reviewed, to be ranked higher or to have a review changed or removed.

Why are there no star ratings?

A star score hides the details that matter, such as a dose far below the research, a proprietary blend or a short refund window. We show the evidence grade for each ingredient and the terms of the offer instead, so you can weigh them yourself.

Have you personally tested the products you review?

No, and we do not claim to. We review what any buyer can check: the public label, the prices across bundles, the refund and subscription terms, and the published research on each ingredient. We say so on every review.

How often are reviews updated?

We recheck a review when the seller changes its price, label or refund terms, or when a source we cite is updated, and at least every six months. Each review shows the date it was last checked and lists its sources with the dates we read them.

How do I report an error?

Use the contact page and tell us the page, the line and the source that shows the correct fact. We check every report. If we got something wrong, we fix it and add a dated correction note at the end of the page.

ProveNutraSupplement reviews, checked

We read the label, check every dose against the research and read the refund terms, then tell you what we found. No star ratings, no fake testimonials, no paid placements.

Edited by Daniel Brooks, Reviews Editor, ProveNutra

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About us

ProveNutra is general information, not medical advice. Dietary supplements are not reviewed by the FDA for safety or effectiveness before they are sold. Talk to your doctor before you start, stop or combine supplements. Some links are affiliate links: if you buy through them we may earn a commission at no extra cost to you, and it never changes what we report.