b12 injection is what drug class Methylcobalamin (Vitamin B12) Vitamin B12 - Wikipedia
Description
Some users prefer weekends when they can rest if side effects emerge
Morandi F, Marimpietri D, Horenstein AL, Bolzoni M, Toscani D, Costa F, et al

Comparing to Oral Supplementation Doses Its important to note that injection doses are much higher than oral supplements
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They are not for human or animal consumption, medical use, or any use not permitted by applicable law.

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