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1 The British Society for Haematology does not recommend retesting vitamin B 12 levels after treatment has been initiated, and no guidelines address the optimal interval for screening high-risk patients
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Factors Affecting the Duration of B12 Injection Benefits Several factors can influence how long the benefits of a vitamin B12 injection last
Best vitamin B12 supplements at a glance Capsules Best high-strength vitamin B12: Dr Vegan Vitamin B12, 9.99 Best vitamin B12 capsule for vegans: Viridian High Potency B12 capsules, 13.30 Runner-up vitamin B12 capsule for vegans: Wild Nutrition Food Grown Vitamin B12 Plus, 15 Best tasteless vitamin B12 capsule: Zooki Vitamin B12 capsules, 39.99 Tablets Best vitamin B12 supplement: ZipVit vitamin B12 1000mcg, 7.49 Best value vitamin B12: Vitabright Dual Active B12 1000mcg, 5.99 Best budget vitamin B12: Holland & Barrett Slow-Release Vitamin B12 1000mcg, 16.49 Liquids Best overall vitamin B12: Viridian Liquid B12, 18.65 Best vitamin B12 for on the move: Zooki Vitamin B12 Strawberry, 49.99 Oral Sprays Best vitamin B12 for digestive issues: BetterYou Boost 1200mcg B12 Daily Oral Spray, 8.53 Jump to section: Best vitamin B12 supplements to buy in 2026 Why do we need vitamin B12
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