You can assess most supplements in about two minutes using the label alone. The trick is knowing which numbers matter, and recognising the formats designed to withhold them.
Start with the Supplement Facts panel
This is the regulated part of the packaging and the only part obliged to be accurate about contents. Everything on the front is marketing. Everything in the panel is a claim the manufacturer has to stand behind.
- Serving size, and how many servings the container actually holds. A 30-capsule bottle at two capsules daily is a 15-day supply
- Each active ingredient with its amount, ideally in milligrams or a comparable unit
- Percent daily value, where one has been established. Many botanical ingredients show a dagger meaning no daily value is set
- Other ingredients, which lists the capsule material, fillers and flow agents
- Allergen statements, which matter more than people assume with protein and probiotic products
- Storage instructions, which are meaningful for live cultures
The single most useful check: proprietary blends
If a label lists a proprietary blend with one total weight and several ingredients underneath, you cannot tell how much of anything you are getting. A 500mg blend could be 495mg of the cheapest ingredient and 5mg of the one you bought it for.
This is common in probiotics. CoreAge Rx, for example, publishes a 36mg probiotic blend containing three named strains without individual amounts, and Codeage publishes a total AFU count without per-strain figures. Neither is unusual for the category, and both are worth noticing.
Is the ingredient at a studied dose?
Find the studied dose
Berberine research referenced by UCLA Health used around 1 gram daily. If a product provides 200mg, it is not delivering the researched amount whatever the label implies.
Check per serving, not per bottle
Marketing sometimes quotes the total across a bottle. The number that matters is what you take in a day.
Watch for the studied form
Research is often specific to a particular extract, standardisation or strain. A different form is not automatically equivalent.
Standardisation percentages
A label reading standardised to 70 percent eriocitrin tells you far more than one reading lemon extract. Prefer the former.
Third-party testing, and what it does and does not mean
Independent testing for identity, potency, contamination and heavy metals is meaningful, because supplements are not tested by the FDA before sale. Look for named programmes such as NSF, USP or ConsumerLab, or a manufacturer publishing its own third-party lot testing as CoreAge Rx describes doing.
What testing does not tell you is whether the product works. A rigorously tested capsule containing an ineffective ingredient is still an ineffective capsule. Testing addresses quality, not efficacy.
Claims language, decoded
- Supports, promotes and helps maintain are structure-function claims, permitted without proving an effect
- Clinically studied often refers to an ingredient rather than the finished product. Check which
- Doctor formulated describes who designed it, not that any clinician assessed it for you
- Patented refers to intellectual property, not efficacy
- The FDA disclaimer at the bottom is the most informative sentence on most labels
- Any claim to treat, cure or prevent disease is not permitted on a supplement, so its absence tells you nothing about efficacy
Supplements are not medication
Nothing on this page is a prescription GLP-1 medication or a substitute for one. Dietary supplements are not approved by the FDA before sale, their claims are not evaluated by the FDA, and they are not intended to diagnose, treat, cure or prevent any disease. No supplement covered here has been shown to produce weight loss comparable to semaglutide or tirzepatide.
Speak to a clinician before starting any supplement, particularly if you take prescription medication, are pregnant or breastfeeding, are immunocompromised, or have a diagnosed condition. See our full medical disclaimer.
A two-minute checklist
Find the Supplement Facts panel. Check the serving size against the container count. Look for exact amounts rather than a blend total. Compare the amounts against the doses used in research for those ingredients. Check for third-party testing. Read the other ingredients line for allergens. Then decide, using the evidence review for what the ingredients actually support.
Frequently Asked Questions
What is a proprietary blend and why does it matter?
A list of ingredients grouped under a single total weight without individual amounts. It means you cannot tell how much of any ingredient you are getting, which makes it impossible to compare against a studied dose. It is the single most useful thing to check on a label.
Does third-party testing mean a supplement works?
No. Testing verifies identity, potency and the absence of contaminants. It says nothing about whether the ingredient produces an effect. A well-tested product containing an ineffective ingredient is still ineffective.
What does clinically studied mean on a label?
Usually that an individual ingredient has been studied, not the finished product. Very few products in this category have trials on the actual formula being sold. Check which is being claimed.
What does doctor formulated mean?
That a clinician was involved in designing the product. It does not mean a clinician has assessed whether it is appropriate for you, and it is not a claim about efficacy.
Why do many ingredients show a dagger instead of a percent daily value?
Because no daily value has been established for that ingredient. This is normal for botanicals and probiotics and is not a red flag in itself, though it does mean you have no reference point for the amount.
What is the most informative part of a supplement label?
Arguably the FDA disclaimer, which states that the claims have not been evaluated and the product is not intended to diagnose, treat, cure or prevent any disease. It is an accurate description of what nobody has verified.
Medical Disclaimer
This article is for general information only and is not medical advice, a diagnosis, or a treatment recommendation. GLP-1 medications are prescription drugs with real risks and contraindications. Only a licensed clinician who knows your history can decide whether any medication is appropriate for you. Pricing, programmes and policies described here reflect what providers published at the time of writing and change frequently; verify everything directly before enrolling. See our full medical disclaimer.