What supplement labels are trying to tell you

Supplement labels can look more complicated than the dose itself. Two things cause most of the confusion: units and scale.

Vitamin D is often listed in both micrograms and International Units. On Call D3 is 50 mcg, which equals 2,000 IU. Those are two ways of describing the same amount. The dose does not change because the unit changes.

Vitamin B-12 is usually listed in micrograms. On Call B-12 is 500 mcg cyanocobalamin. The NIH Office of Dietary Supplements notes that absorption is not linear at higher oral doses, which is why bigger label numbers should not be mistaken for better design.

The useful question is not, "Which bottle has the largest number?" The useful question is, "What amount was chosen, why was it chosen, and does it fit within established safety references?"

That is the quieter way to read a supplement label. Less shelf theater. More dose logic.

Sources: NIH Office of Dietary Supplements vitamin D fact sheet and vitamin B12 fact sheet.

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