How can you tell if a supplement dosage is clinically meaningful?
Last updated: August 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy
Compare the amount on the label against the dose used in the human trials for that ingredient, and check that the form matches. Underdosing is the norm in multi-ingredient products — a long ingredient list is usually a sign that most of them are present in token amounts.
Key takeaways
- Look up the trial dose for each ingredient and compare it to the label.
- A proprietary blend makes this check impossible — that is what it is for.
- Form matters as much as milligrams: magnesium oxide and glycinate are not equivalent.
Do the arithmetic
Find the dose used in human trials for the ingredient and compare. Some reference points: curcumin 500–2,000 mg enhanced, Bacopa 300 mg standardised, ashwagandha 300–600 mg, CoQ10 100–300 mg, citicoline 250–500 mg, beta-alanine 4–6 g daily, creatine 3–5 g, glucosamine sulphate 1,500 mg. Then check the capsule size. A capsule holds roughly 500–800 mg of powder. If a product claims twelve ingredients in one capsule, at least ten of them are present in amounts no study has ever tested.
Proprietary blends
A proprietary blend lists several ingredients with one combined total. Regulations permit this and it exists precisely to prevent the comparison above. The ingredients are listed in descending order by weight, so the first is the most abundant — but you cannot tell whether it is 90% of the blend or 30%. Expensive ingredients are usually at the end of the list, in trace amounts, present so they can appear on the label. Treat a proprietary blend as an answer in itself.
Form and standardisation
Milligrams alone are not enough. Magnesium oxide is roughly 4% absorbed against far higher for glycinate. Plain curcumin is barely absorbed without an enhancer. Botanical extracts should state standardisation — Bacopa to 20% bacosides, Boswellia to AKBA content, milk thistle to 70–80% silymarin. Without standardisation, the active content of a herbal extract is unknown even when the milligrams look right.
Key ingredients to understand
The ingredients most relevant to this question, with what the evidence actually supports:
- Turmeric / Curcumin — Curcumin, the active compound in turmeric, has anti-inflammatory properties and modest evidence for easing osteoarthritis joint pain. Its…
- Magnesium — Magnesium is an essential mineral involved in hundreds of body processes, including nerve and muscle function, energy and blood-sugar control.…
- Coenzyme Q10 (CoQ10) — CoQ10 is a compound your cells use to make energy and as an antioxidant. It is popular for heart health, statin-related muscle aches and…
Frequently asked questions
What does 'proprietary blend' really hide?
The individual amounts — which is the only information that lets you judge whether the product can work.
Are higher doses always better?
No. Several ingredients have a ceiling or a downside above it: vitamin B6 causes neuropathy, D-chiro-inositol harms egg quality, high-dose beta-carotene raised lung cancer risk in smokers.
Where do I find the trial dose?
Our ingredient guides list the dose used in studies for each one, with the citations behind it.
Related on FactoWiki
- All health answers
- Ingredient evidence guides
- Turmeric / Curcumin — ingredient guide
- Magnesium — ingredient guide
- How we review
This article is general information, not medical advice. FactoWiki may earn a commission from links on product review pages (never on comparisons). Always check with a qualified healthcare professional about your own situation.