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wiki how to give b12 injections Safe Injection Guide at Home B12 Injections at Home -
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I have gotten the shingles vaccine, also MMR & Tdap boosters without serious side effects (except for a frozen arm for 1 week after the Tdap), but I once had a long term reaction to a flu vaccine which caused shortness of breath for many months

Gentle rolling is the only acceptable mixing technique

At a 20mg/mL concentration, maintenance doses stay in the comfortable range: 8mg requires 0.4mL (40 units) and 12mg requires 0.6mL (60 units)
