vitamin b12 injection before and after Client Spotlight (Before & After) Vitamin B12 Injection | Revay
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5-methyltetrahydrofolate administration is associated with prolonged survival and reduced inflammation in ESRD patients
if you develop symptoms like hives, difficulty breathing, chest tightness, or severe dizziness after an injection, seek medical attention, as those could indicate an allergic reaction (which is extremely uncommon)

If you are not deficient, I believe it is safe to take a B12 supplement at a lower dose
Trials showed good tolerability and placebo-like side effect profile
