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John DiBella Published: November 3, 2025 Fact-checked by Dr
Medicines which can decrease the absorption of Vitamin B12 include: Colchicine (a medicine used to treat gout) Metformin (an anti-diabetic agent) Excessive Alcohol Vitamin C products
Subcutaneous injections deliver compounds into the fatty tissue beneath the skin, allowing for gradual absorption into the bloodstream
UK B12 treatment for B12 deficiency without neuro symptoms is 6 loading jabs over 2 weeks followed by a jab every 3 months for B12 deficiency with neuro symptoms present, it is a B12 loading jab every other day for as long as symptoms continue to get better (could mean loading jabs for weeks even months) then a jab every 2 months UK b12 documents BMJ B12 article bmj.com/content/349/bmj.g5226 BSH Cobalamin and Folate Guidelines b-s-h.org.uk/guidelines/gui
What steps should I take if I experience discomfort after a B12 shot
