B12 Dosage Guide

Our assessment

Based on FDA data, Vitamin B12 has not been shown to cause any harm, even at high doses. This makes its overall safety profile exceptionally favorable compared to many other supplements FDA FAERS ↗.

Safety profile

Data on specific adverse event reports for Vitamin B12 is not available in the provided dataset. The FDA data confirms that Vitamin B12 has not been shown to cause any harm, even at high doses, and no specific side effects with report counts were provided FDA FAERS ↗.

How it works

Vitamin B12 supplements can interact or interfere with some medicines that you take. If you are on any prescription medications, it is important to discuss Vitamin B12 supplementation with your healthcare provider to check for potential interactions FDA FAERS ↗.

Our recommendation

Because Vitamin B12 has not been shown to cause any harm even at high doses, it is generally considered very safe for most people FDA FAERS ↗. However, always consult a healthcare professional before starting any new supplement, especially if you take other medications, to review potential drug interactions FDA FAERS ↗.

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