Can B12 help with skin aging?

Vitamin B12 (cobalamin) is essential for skin health, playing a role in cell division, DNA synthesis, and red blood cell formation. Deficiency can cause pallor, hyperpigmentation, glossitis, and potentially accelerated skin aging. However, evidence that B12 supplementation reverses or prevents skin aging in well-nourished individuals is weak. Some small studies suggest topical B12 may improve skin hydration and elasticity, but results are inconsistent and often industry-funded. Most anti-aging claims are marketing-driven rather than supported by robust human trials. Additionally, high-dose B12 supplementation in non-deficient individuals may paradoxically trigger acne in some people. Key drivers of skin aging—UV exposure, collagen degradation, oxidative stress—are not directly addressed by B12. A blood test can identify deficiency, but for general anti-aging, a balanced diet, sun protection, and proven ingredients (e.g., retinoids, vitamin C) are more evidence-based. Overall, B12 is not a proven anti-aging intervention unless deficiency is present. Evidence grade: mixed (mechanistic and observational, lacking strong interventional data).