Tag: 2500 mcg b12

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Is 2500 B12 Too Much to Take Daily? Understanding High-Dose Supplementation

Dec 21, 2025 •

4 min read

The Recommended Dietary Allowance (RDA) for vitamin B12 in adults is just 2.4 mcg, making a 2500 B12 dose appear astronomically high. However, the body's complex and limited absorption mechanism for this water-soluble vitamin means that a megadose like this is handled differently than smaller, dietary amounts.

Is 2500 mcg of vitamin B12 too much to take?

Dec 6, 2025 •

4 min read

The recommended dietary allowance (RDA) for vitamin B12 in adults is only 2.4 mcg per day. This makes a 2500 mcg dose seem excessive, but because the body absorbs only a small percentage of high-dose oral vitamin B12, taking 2500 mcg is generally considered safe for most healthy individuals.