bruising from b12 injection Why do I feel worse after a injection? Possible allergic reaction to B12

These shots are administered via intramuscular injection (often referred to as IM) so there is no gastrointestinal metabolism, which also allows for increased nutritional absorption

doi: 10.1083/jcb.200210169

7 Compared with placebo, patients taking metformin had an increased risk of vitamin B 12 deficiency (number needed to harm = 14 per 4.3 years) and low vitamin B 12 levels (number needed to harm = 9 per 4.3 years)

Coln E, Svechnikov KV, Carlsson-Skwirut C, Bang P, Soder O

2 B12 2 B12

The FDA has explicitly warned that botulinum toxin products from outside the approved US supply chain including those marketed as research grade or sourced from overseas compounders are not approved for human use and present serious risk of systemic botulism, which can cause difficulty breathing, swallowing, and speaking, and can be fatal