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It is not recommended to take tetracycline and vitamin B12 simultaneously, and the reason is that tetracycline will interfere with the effectiveness and absorption of vitamin B12
Vitamin B12 shots are recommended for people who cannot absorb enough through food or oral supplements
Some people use it to boost physical performance (though its banned by the World Anti-Doping Agency, so its a no-go for athletic competition)
Adverse Reactions/Side Effects Vitamin B12 is known to be non-toxic even in high doses
Any existing symptoms of B12 deficiency (such as fatigue or dizziness) may begin to alleviate
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