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SUPPLEMENT GUIDE

Vitamin D3

Read the amount and the unit together: micrograms or international units — Drops vary in concentration — Compare the labelled serving rather than assuming that one drop is equivalent across brands

Read the label ↓
Category illustration, not a commercial product

What to check on the label

  • Distinguish D3 from D2 and combined D3 + K2 formulas
  • Check the amount per capsule, drop or millilitre
  • Consider other vitamin D sources with your clinician

Common formats

Capsules

Check the serving size as well as the amount

Drops

Confirm whether the amount refers to a drop or a millilitre

D3 + K2

Read both ingredients and their separate amounts

Compare on the same basis

Add product price, delivery and applicable costs, then divide by labelled servings. The result compares cost, not effectiveness or a suitable dose.

Sources and checks

Checked on 2 November 2026

Cost per serving calculator

Use the same currency for every amount — this tool does not convert currencies or recommend a dose

Explore other categories

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Magnesium

Read the exact form, such as glycinate, citrate or oxide

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Omega-3

Find EPA and DHA per serving

SUPPLEMENT GUIDE

Collagen

Identify bovine, marine, eggshell or other sources

Information for comparison, without individual dosing advice. Supplements do not replace a varied diet or prescribed treatment. Discuss use with a doctor or pharmacist.