Free Tool
Supplement Dosage Calculator
Get general, evidence-based dosage guidance for popular supplements — scaled to your body weight where it matters.
Your dosage guidance appears here
Choose a supplement and enter your body weight to see a general, evidence-based daily dosage range.
Recommended daily amount
per day
Good to know
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This tool provides general educational guidance only and is not medical advice or a prescription. Always follow the directions on your product label and consult a healthcare professional before starting any supplement, especially if pregnant, breastfeeding, taking medication or managing a health condition.
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Clinically dosed, GMP-certified supplements made in the UK.
Why dosage matters
Many supplements are underdosed in cheap products, while others are easy to overdo. The right amount depends on the ingredient — some scale with your body weight (like creatine loading or caffeine), while others have a fixed effective range regardless of size (like vitamin D).
This tool gives general, research-informed ranges to help you understand sensible amounts. Always follow the directions on your specific product label, as concentrations vary between brands.
Using supplements safely
- ✓ Start at the lower end of a range and build up.
- ✓ Always read your product's label and follow its directions.
- ✓ Check for interactions if you take medication.
- ✓ Speak to a doctor if pregnant, breastfeeding or managing a condition.
- ✓ More is rarely better — consistency beats megadosing.
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