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A 2017 study found that B12 supports healthy sperm by increasing sperm count and reducing damage to DNA

[PubMed: 19752219] 106

A randomized, double-blind, placebo-controlled trial in 153 older adults taking the antidepressant citalopram found daily supplementation with 500 g vitamin B 12 , 2 mg of folic acid, and 25 mg of vitamin B6 for one year did not reduce the severity of depressive symptoms but increased the response to drug treatment and helped to prevent symptom relapse (112), suggesting B-vitamin supplementation might provide some benefit as an adjunct therapy

doi: 10.1182/blood-2009-06-189209

The primary mechanism of tumor killing via NK cells involves releasing cytotoxic molecules through a degranulation process