A decoder for supplement marketing: what "30% off sitewide" and "clinically proven" really mean
Supplement pages mix discount language with health language. How to tell evidence from advertising, and how to compare prices fairly.
Supplement stores are among the most aggressive with discounts and claims. Some caution helps you spend wisely. This is general information, not medical advice.
"Clinically proven"#
Ask: proven for what, in whom, at what dose and by whom? A study on one ingredient at a high dose doesn't prove your product with a lower dose works. Look for named studies on the same ingredient and amount, preferably independent and peer-reviewed. A footnote that points nowhere is not evidence.
"Natural"#
It doesn't mean safe or effective. Plenty of natural substances are harmful at the wrong dose or interact with medicines. Check with a pharmacist if you take prescription drugs.
"Detox" and "boost"#
These terms are vague and rarely backed by approved health claims. In the UK and EU, health claims on products must be authorised. In the US, supplements can describe effects on structure or function but cannot claim to treat or cure disease, and they should carry a disclaimer that the FDA hasn't evaluated them.
Testimonials and before-and-after photos#
They're marketing, not data. People who don't see results rarely appear on the page.
Read the supplement facts#
Check the active ingredients, the form and the amount per serving, and compare with recommended intakes. Watch for "proprietary blends" that hide the amount of each ingredient.
Quality marks#
Look for third-party testing such as independent quality schemes, and for manufacturing to recognised standards. These do not prove the product works, but they help show it contains what it says.
Discount language#
"30% off sitewide" and codes found on third-party sites are often out of date. Check the store's own banner or newsletter for the current offer, and be wary of countdown timers that restart. A permanent sale price is the price.
Compare cost per serving#
Work out the price per daily dose: price divided by the number of servings. Sale prices on big tubs can be cheaper per serving but only help if you finish them before they expire.
Check returns#
Opened supplements are often non-returnable for hygiene reasons. Check the policy before you buy a large size, and try a small one first.
Our rule#
If a page makes a health promise it can't back, we skip it. Evidence first, discount second.