Vitamin B12 Dosage Guide

Our assessment

Based on the data provided, vitamin B12 has not been shown to cause any harm, even at high doses. This is the most important finding for patient safety: the available information indicates a very favorable safety profile with no established toxicity FDA FAERS ↗.

Safety profile

Data not available. The provided FDA data does not include any specific adverse event reports, side effect descriptions, or report counts for vitamin B12. No side effects with report counts can be stated from the given information FDA FAERS ↗.

How it works

Vitamin B12 supplements can interact or interfere with some medicines that you take. The data confirms that drug interactions are a known concern, though specific interacting medications are not listed in the provided data NIH ODS ↗.

Our recommendation

Because vitamin B12 has not been shown to cause harm even at high doses, it is generally considered safe for most individuals. However, because it can interact with certain medications, you should consult your healthcare provider before starting a supplement, especially if you take prescription drugs NIH ODS ↗.

Dietary Reference Intakes (DRIs) are a set of reference values used to plan and assess nutrient intakes of healthy people. They include:

• RDA (Recommended Dietary Allowance) — The average daily intake sufficient to meet the nutrient requirements of nearly all (97-98%) healthy individuals.
• AI (Adequate Intake) — Established when evidence is insufficient to develop an RDA. Based on observed nutrient intake by healthy people.
• UL (Tolerable Upper Intake Level) — The maximum daily intake unlikely to cause adverse health effects. Exceeding the UL increases the risk of toxicity.

Values vary by age, gender, and life stage (pregnancy, lactation).

Source: National Academies of Sciences, Engineering, and Medicine