Value math
Cost Per Dose: The Number That Matters
Bottle price hides the truth. Cost-per-dose reveals it.
Short answer
Cost-per-dose is the monthly cost divided by the number of servings. It removes bottle-size and serving-size tricks and lets you compare two products in seconds.
Key comparison points
- 01Why bottle price is misleading
- 02How to calculate cost-per-dose
- 03Serving size traps
- 04Subscription pricing gotchas
- 05How much variation is normal
- 06A reasonable cost-per-dose for magnesium
Same dose, different value
| Bottle price | Servings | Cost / dose |
|---|---|---|
| £12 | 30 | £0.40 |
| £18 | 30 | £0.60 |
| £34 | 30 | £1.13 |
What Fair Shelf compares
- Cost-per-dose, not cost-per-bottle
- Subscription vs one-off pricing
- Servings per container
Stop reading. Start comparing.
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Related magnesium guides
Value pickBest Value Magnesium Glycinate in the UKForm explainerMagnesium Glycinate vs BisglycinatePricingWhy is Magnesium So Expensive?Informational only — not medical advice. Fair Shelf does not tell you to start, stop or switch supplements. Always check the label and speak to a qualified professional if unsure.