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"A diet that includes meat, fish and dairy products usually provides enough vitamin B12, but people who do not regularly eat these foods can become deficient," notes the NHS

Tavakoli, J., Diwan, A

Histone methylation and aging: lessons learned from model systems
During the next 30 years, up to 22% of the world population will be older than 60 years (210)

Vitamin B6 and B12, together with folate, are also essential for DNA synthesis