NutriCology B12 Adenosylcobalamin 3000 mcg with Folic Acid

Our assessment

The evidence shows that this supplement contains 3000 mcg of adenosylcobalamin (a form of vitamin B12) along with folic acid. Data on the specific ingredients in this product is limited. For the ingredient calcium, which is not in this product, the NIH ODS notes that it supports bone mineralization and neuromuscular relaxation [NIH ODS]. For this specific B12 formulation, our assessment is that it is intended to support energy and nerve health, but you should verify your need for such a high dose with a healthcare provider.

How it works

Adenosylcobalamin is a naturally occurring, active form of vitamin B12 that plays a key role in your body's energy production and the maintenance of healthy nerve cells. Think of it as a cellular fuel injector — it helps your mitochondria convert food into usable energy [NIH ODS]. The addition of folic acid works alongside B12 to support red blood cell formation and DNA synthesis. For context, the related ingredient calcium works through bone mineralization and neuromuscular relaxation, though this is not directly applicable to your product [NIH ODS].

Safety profile

Data not available for adverse events specific to this product. The FDA has received a total of 592,059 reports across all dietary supplements [FDA data]. For the ingredients in this supplement, specific side effect data is not provided in the available data. Note that high levels of B12 are generally considered safe as excess is excreted in urine, but you should always follow the recommended dosage on the label.

Our recommendation

Start by consulting your doctor to check your current B12 and folate levels before taking this high-dose supplement. A dose of 3000 mcg is significantly higher than the standard RDA, and is typically used for diagnosed deficiencies or absorption issues [NIH ODS]. We recommend taking it as directed on the label, and be aware that calcium supplements can interact with medications like bisphosphonates and antibiotics, though this does not apply to your B12 product [NIH ODS].

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