Amazon.com: Purest vantage Vitamin B Complex Vitamins B12, B1, B2, B3, B5, B6, B7, B9, Folic Acid - Super B Complex Vitamins for Women, Men, Adults - 90 Vegetarian Capsules : Health & Household
Amazon.com: Vitamin B Complex with Vitamins B6 20mg, D3 1000IU, Albion Magnesium Bisglycinate 260mg, Methyl B12 1000mcg, and Folate as Methylfolate 600mcg DFE. Doctor Formulated MTHFR Support Supplement. : Health & Household
Age, gender, and vitamins: Older males have lower B12, B6 level post-supplementation