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Despite its importance, many people find it difficult to get enough B-12 from diet alone, leading to fatigue, weakness, and a sluggish metabolism
Individuals were excluded if they had a vasectomy, Y-chromosome microdeletions, Klinefelter syndrome, cystic fibrosis, physical impairments leading to infertility, or used fertility-related medicines in the past six months
receptor-specific inhibition and genetic loss-of-function controls
This means even people with a B12-rich diet can fall short as they get older
But with Jeff its so easy
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