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Vitamin B12

Morning, sublingual for better absorption

Vitamin B12 (cobalamin) is a water-soluble essential vitamin found primarily in animal products such as meat, fish, eggs, and dairy. It plays a critical role in red blood cell production, neurological function, and DNA synthesis, making it one of the most important micronutrients for overall health.

Gil Carvalho
Gil CarvalhoReported use
Research Evidence
May improve mood and depressive symptoms in deficient populations
Limited
Supports healthy neurological function and may slow cognitive decline in deficient individuals
Moderate
May reduce homocysteine levels when combined with folate
Moderate
Prevents and treats B12 deficiency and megaloblastic anemia
Strong
May support energy levels in individuals with suboptimal B12 status
Limited
Essential for proper red blood cell formation
Strong
Source: Examine.com

Expert Evidence

26 references from 5 experts

“Next thing I take is a B12. And this I just take once a week... it's been shown many times that it's perfectly effective and you get all you need.”

Doctor Reveals his complete Supplement Stack

6:33

13 references in 7 episodes from 2020–2026

Safety & Cautions

Side Effects

  • Mild nausea at high doses
  • Skin rash in rare cases
  • Headache
  • Anxiety or restlessness at very high doses
Vitamin B12 is generally considered very safe, even at doses well above the RDA, since excess is excreted in urine. However, individuals with certain conditions like Leber's disease should consult a healthcare provider before supplementing, as B12 can worsen optic nerve damage in this population.
Pairs Well With
IronVitamin D3Omega-3 Fatty Acids (EPA)