How this compares to other Vitamin C products Popularity Top 10% Vitamin C products Trending +450% Compared to last 30 days Quality rank Low Lower TrustScore than 97% of Vitamin C products Cost rank Average More affordable than 37% of Vitamin C products Loading related products
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According to WebMD, to treat B12 deficiency: Injecting 0.2 mcg/kg of vitamin B12 into the muscle or under the skin once daily for 2 days, followed by a 1000 mcg injection daily for 2-7 days and another 100 mcg injection weekly for 4 weeks thereafter has been used
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Last reviewed: July 3, 2026 Last updated: July 3, 2026 Written by: Jay Hastings, CEO of PlexusDx Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations