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Praveen, Guruvaiah, et al
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In other words, pills can take longer to raise B12 levels, so if you need a quick boost, injections are the better choice
A 2017 study found that B12 supports healthy sperm by increasing sperm count and reducing damage to DNA
Vitamin B12 injections can be a useful supplementation method for vegans and vegetarians who might struggle to maintain healthy vitamin B12 levels through diet alone
Many do well on oral supplements, but someone who is already symptomatic and confirmed low may recover faster with injections before switching to oral maintenance
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