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    Vitamin B12

    also cyanocobalamin, methylcobalamin, adenosylcobalamin

    Vitamin B12, also known as cobalamin or extrinsic factor, is a water-soluble vitamin involved in metabolism. It is one of B vitamins. It plays an essential role in the nervous system by supporting myelin synthesis. It is needed for DNA synthesis and for the maturation of red blood cells in the bone marrow. It serves also as a vital cofactor in both fatty acid and amino acid metabolism. As humans cannot make it, it is required in the diet, making it an essential nutrient. Animals require B12 but plants do not, relying instead on alternative enzymatic pathways.

    Information, not medical advice. Talk to a licensed doctor or pharmacist before starting or changing a treatment.

    Research 10

    1. The association between the levels of Ferritin, TSH, Zinc, Hb, vitamin B12, vitamin D and the hair loss among different age groups of women: A retrospective study International journal of pharmaceutical research · 2021 · 1 citations
    2. G.P.2.16 Valproate, acetylcarnitine, folic acid and vitamin B12 in spinal muscular atrophy: Preliminary data of an open-label study in children Neuromuscular disorders · 2007 · 1 citations
    3. Effect of zinc, ferritin, and vitamin B12 deficiency on hair loss in pregnant women International Journal of Health Sciences (IJHS) · 2022
    4. Repigmentation of Leukotrichia Due to Retrograde Migration of Melanocytes After Noncultured Epidermal Suspension Transplantation Dermatologic Surgery · 2013 · 17 citations
    5. Evaluation of the relationship of digital phototrichogram findings of patients with diffuse hair loss with blood TSH, ferritin and vitamin B12 levels İstanbul Kuzey Klinikleri · 2024
    6. Breaking the Hair-Loss Barrier: Pattern-Wise Efficacy of Verilich Serum Journal of Clinical and Investigative Dermatology · 2026
    7. Effect of Zinc, Iron, Ferritin, Vitamin B12 and thyroid function on hair Loss in Iraq Women International journal of chemical research and development (Print) · 2024
    8. Reversible Hyperpigmentation of Skin and Nails With White Hair due to Vitamin B12 Deficiency Archives of Dermatology · 1986 · 77 citations
    9. Estimation of Vitamin D, B12, Zinc, and Ferritin in Women Have Hair-Loss Humanitarian and Natural Sciences Journal · 2025
    10. A comparative study on the association of serum ferritin and vitamin D, and B12 levels among individuals with hair loss Portuguese Journal of Dermatology and Venereology · 2024
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    Community 10

    1. 4 months difference after taking D3 vitamin pills and Anti hair fall shampoo only Reddit · 7 Aug 2024
    2. Topical foam 5% Min, Vitamin B12, and Vitamin D treatment since July Reddit · 25 Nov 2025
    3. Can low level of vitamins cause hair loss? Reddit · 19 Dec 2023
    4. 6 month progress thank god i started Reddit · 13 Feb 2026
    5. B12 deficiency hairloss (hair thinning) Reddit · 18 Aug 2025
    6. 2020-2024 journey. 1mg Finasteride daily. 5% minoxidil daily. Reddit · 29 Jul 2024
    7. B5 (Pantothenic acid), B7 (Biotin), B12 Reddit · 15 Mar 2024
    8. 4 months of restarting treatment. M36 Reddit · 10 Dec 2025
    9. 22M – Minoxidil didn’t work, bloodwork showed deficiencies, doctors dismissed me – not sure what to do next Community · 21 Jul 2025
    10. B12 and D Vitamins very low (bloodwork showed 15 for D). Dutasteride and Minoxidil not holding back the hairloss. Should i supplement? Reddit · 19 Dec 2025
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