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This is also how researchers were able to discover that GHK declined during the aging process, since the aged cells were not able to begin regeneration until introduced to young blood cells

It might be caused by a viral infection, environmental causes, or hereditary factors (Ghasemi et al., 2017)

Vitamin B12 may play a role in fertility by supporting proper hormone balance and reproductive health." Agyeman also says that vitamin B12 is involved in bone metabolism and mineralization, so having adequate levels of B12 is especially important for women as they are more prone to bone disorders like osteoporosis

Figure 7

Stress boosts cortisol and can interfere with ovulation and sperm production