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83 One study found these polymorphisms were more common in 167 men with abnormal sperm parameters compared with 78 men with normal sperm
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However, while you can get them through natural sources, some people are still not getting enough vitamin B12 daily (like vegetarians or vegans)
Potential Risks Risks depend on the exact product and your health history, but can include: Injection-site reactions (pain, bruising, swelling) Allergic or hypersensitivity reactions (rare but possible) Product-quality risks if the mixture is compounded and not prepared under appropriate standards For B12 injections specifically, review FDA-approved labeling and warnings (see the FDA prescribing information for cyanocobalamin injection )
An alternative conservative start uses 1mg for the first four weeks before moving to 2mg
Zhe, W., et al
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