When to see a doctor Please seek medical advice promptly if you have any of the following after a B12 injection: Chest pain, a fast or irregular heartbeat, or breathlessness
Biotin is also involved in the maintenance of healthy hair, skin and nails
Anyone pregnant, breastfeeding, or with a diagnosed metabolic, hepatic, or endocrine condition falls entirely outside any studied context and should not be a subject of self-directed use
Best overall: Thorne Vitamin B12 | Skip to review Best multivitamin with B12: Mindbodygreen Ultimate Multivitamin+ | Skip to review Best vegan: HUM Nutrition B12 Turbo | Skip to review Best liquid B12: Pure Encapsulations B12 Liquid | Skip to review Best gummy: OLLY Daily Energy Gummies | Skip to review Best whole-foods supplement: Garden of Life Vitamin Code Raw B12 Capsules | Skip to review Most affordable: Nature Made B12 Softgels | Skip to review Best allergen-free: Pure Encapsulations Methylcobalamin Capsules | Skip to review Best B complex vitamin: Nordic Naturals Vitamin B Complex | Skip to review Vitamin B12 is an essential dietary nutrient necessary for energy production and proper functioning of your nervous system, among other important roles
Why it matters: Monitoring helps connect symptom changes with lab response and safe refill planning