can you be allergic to b12 injections itchy skin after Been on T for 5 weeks, all sites suddenly (in the past few days) became red and : r/ftm What Happens When You're – Are B12 Shots Safe? Royal

Fatigue is usually the first red flag

There is no need to take very high doses of vitamin B12

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Vitamin B12, also known as cobalamin, plays a crucial role in: Red blood cell production Nerve function DNA synthesis Energy production and metabolism A deficiency in Vitamin B12 can lead to fatigue, anemia, nerve damage, and cognitive issues