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how long do you give b12 injections for Often Can I Take Injections? Vitamin B12 Injections Dosage and
Description
2 weeks 1 vial Covers about 10 to 20 days at the example doses

Int J Obes (Lond) 2006;30(12 ): 172936
How do I know if an injection is the right option for me

This suggests that GLP-1 receptor activation alone may not substantially increase deficiency risk
without it, you're not getting anywhere
