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vitamin b12 injection sites Sites: All You Need to Know Vitamin B12 Injections
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1990;258(5 Pt 1):C755786
The drawing needle is typically a bit thicker, or larger in gauge, which makes pulling the vitamin solution into the syringe much smoother and quicker

The post doesn't speak directly to neuropathy or early-sobriety recovery, but it does note that B vitamins are essential for nerve function and that severe deficiency can contribute to neurological problems, including Wernicke-Korsakoff syndrome

Teppala S, Shankar A
