How we rank

This page explains how we choose, rank and link to supplements, and what we won’t do. It is written for beginners, so we keep it plain. It is general information, not medical advice.

Independence

We don’t sell supplements. We have no products of our own, and brands can’t pay to be listed, or to be listed higher. On November 3, 2026 the site’s owner, Sameer, decided that the site stays fully independent for now: no own-brand products, and affiliate links as our way of earning from product recommendations.

How we earn

Some links on this site are affiliate links. If you buy through one, the retailer or brand may pay us a commission at no extra cost to you. That commission never changes a ranking, a label such as “best value”, or what we say about a product. We choose and rank first, then add links.

If we ever accept sponsorship, it will be labeled as advertising and it will not change a ranking or a finding. Our affiliate disclosure and editorial policy have the full wording.

How we choose and rank products

We look at the same things for every product:

1. Third-party testing. We look for published testing by an independent party, such as NSF Certified for Sport, Informed Sport, or a certificate of analysis (COA) from an ISO 17025-accredited lab. We show what each product states, and we say whether it is a certificate we could find or only the brand’s own statement. A manufacturing standard such as GMP is not a test of the product, and we say so.
2. Dose that matches the evidence. We compare the amount in a daily serving with the doses used in studies, as set out on our supplement page for that ingredient. A pack with a much lower dose than the studies, or a confusing serving size, is flagged.
3. Price per daily dose. We work out the cost of one day’s dose, not just the pack price, so different pack sizes can be compared. The basis (for example “per 300 mg”) is shown beside each price.
4. Legality in Great Britain. Where an ingredient has rules, we follow the Food Standards Agency register. For example, nicotinamide riboside chloride is limited to 300 mg a day for adults (230 mg a day for pregnant and breastfeeding women), and trans-resveratrol is limited to 150 mg a day for adults.
5. Where you can buy it. We show retailers for your region (UK, US or worldwide), with prices in pounds or dollars. A product that is easy to buy in one region may not be sold in another.

Labels such as “best overall”, “best value” and “best tested” are our judgment from these checks. We don’t run laboratory tests ourselves and we haven’t taken products to a lab. We rely on published testing and on what brands and retailers publish, and we say when that information is missing.

What we won’t link to

• Products whose legal status is unclear or restricted. Legal status varies by country. For example, neither NMN nor urolithin A is authorized as a food supplement in Great Britain (both are still under review by the Food Standards Agency). We explain them in our guides, but we don’t link to buy them anywhere.
• Doses above legal limits. For UK offers, we don’t link to packs whose daily label dose goes above the limit for that ingredient, or we flag it clearly where a higher serving is only an option.
• Brands with no verifiable testing information. If we can’t find any testing statement from the brand or an independent body, we don’t recommend the product.

How we check prices

Prices are checked on the retailer’s own page, and the date we checked is shown next to each price. Prices change often and sales end, so the price at the shop may differ from ours. Prices also differ by region and pack size, and some retailers only ship to certain countries. If we can’t confirm a price, we leave it blank rather than guess. Always check the price and the label at the shop before you buy.

Corrections and updates

Each page shows when it was last reviewed. We re-check prices, availability and legal status, and we update a page when something changes, such as a new legal ruling or new published research. If you find a mistake, please contact us. We will check it and fix confirmed errors, and we aim to note significant corrections on the page.

Medical disclaimer

This site is for general information and is not medical advice. Supplements are not a substitute for a healthy lifestyle or for medical care. Talk to a doctor or pharmacist before you start a supplement, especially if you are pregnant or breastfeeding, take medicine, or have a health condition. See our medical disclaimer.

FAQ

Can a brand pay to be ranked higher?

No. Brands can’t pay for placement, and affiliate commission doesn’t change rankings. Any sponsorship would be labeled as advertising and wouldn’t change a ranking.

Do you test the supplements yourselves?

No. We don’t run lab tests. We use testing that others have published, such as NSF Certified for Sport, Informed Sport or lab certificates of analysis, and we say when a product has none.

Why is there no buy link for NMN?

Legal status varies by country (for example, neither NMN nor urolithin A is authorized as a food supplement in Great Britain), so we write about them but don’t link to buy them anywhere.

Why don’t the prices match what I see in the shop?

Prices change often, and they differ by region and pack size. Each price on our pages shows the date we checked it. Please check the retailer’s page before you buy.

Do you sell your own supplements?

No. We don’t sell supplements and we have no own-brand products.

What should I do if I think something on the site is wrong?

Contact us and tell us which page and what looks wrong. We will check it and correct confirmed errors.