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B12 Injection Needle Size | B12 Syringes | Is b12 im or sq Weight:5mg Thiamin injection http://bluehorizonbloodtests.co.uk/cdn/shop/articles/gut-health-blog-hero-01_4968f3f7-f909-40e9-accc-620ef1caa940.webp?v=1785370208 What B12 does in your body Vitamin B12 (cobalamin) is a water-soluble nutrient found mainly in animal foods like meat, fish, eggs, and dairy