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Intramuscular sites include the arm, thigh, and hip
The well-known geriatrician-haematologist Larry Solomon, working at Yale University in the USA, wrote 20 years ago: if I had treated only those people who actually had too low serum B12 and elevated MMA values, then I would not have treated approximately two-thirds of the people with a favourable response to B12 supplementation (note: partly via injections, partly via oral supplementation)
Ensure youre getting enough B12 schedule your injection now!
However, as long as you create the proper window (2-3 hours after eating), nighttime administration is also perfectly effective
It is simple, and it can settle your gut fast
By Manuel Bowman Fact-checked by Payton Olsen Last updated June 2026
