Natural Factors B12 Methylcobalamin 5000 mcg
Brand: Natural Factors · Form: TABLET [E0155] On Market
Our assessment
The evidence shows that this supplement contains a very high dose of vitamin B12 (5000 mcg as methylcobalamin). While B12 is a water-soluble vitamin and excess is typically excreted, such high doses are generally only necessary for individuals with proven absorption issues or a diagnosed deficiency. For most people, standard doses are sufficient and more appropriate [NIH ODS].
How it works
Vitamin B12 is a critical nutrient for your body. It plays a key role in red blood cell formation, neurological function, and DNA synthesis. The methylcobalamin form is the active coenzyme form, which your body can use directly without needing to convert it from other forms like cyanocobalamin [NIH ODS].
Safety profile
Data not available on specific adverse events for this exact product. However, the FDA has received a total of 592,059 adverse event reports across all dietary supplements. For B12 specifically, side effects are rare at high doses, but can include mild diarrhea, itching, or a feeling of swelling. Because this is a very high dose (5000 mcg), you should be aware that it far exceeds the Recommended Dietary Allowance of 2.4 mcg daily for adults [NIH ODS] [FDA data].
Our recommendation
Our assessment is that you should only use this high-dose B12 supplement if you have a confirmed medical need, such as pernicious anemia, a gastrointestinal condition affecting absorption, or a strict vegan diet with a known deficiency. For general wellness, a standard 100-500 mcg dose is more appropriate and carries less risk of unnecessary over-supplementation. Always consult your healthcare provider before starting a high-dose regimen [NIH ODS].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | Natural Factors |
|---|---|
| Serving Size | |
| Contents | 60.0 Chewable Tablet(s) |
| Market Status | On Market |
How to Read This Label
Supplement labels contain several key sections regulated by the FDA:
- Serving Size — The recommended amount per dose. Always check this — some products require multiple capsules per serving.
- Amount Per Serving — Shows the quantity of each nutrient in the product, typically in IU (International Units), mg (milligrams), or mcg (micrograms).
- % Daily Value (%DV) — Indicates how much a nutrient in a serving contributes to a daily diet. 5% DV or less is low; 20% DV or more is high.
- Other Ingredients — Lists inactive ingredients like fillers, binders, and capsule materials (e.g., gelatin, cellulose, magnesium stearate).
- Suggested Use — The manufacturer's recommended directions for taking the supplement, including timing and dosage.
Source: FDA Dietary Supplement Labeling Guide