B vitamins & energy
Moderate evidenceB Vitamins, Energy and Mood: The Methylation Link
How B6, folate and B12 power neurotransmitter production — and why deficiency shows up as fatigue and flat mood before anything else.
B vitamins rarely make headlines, which is a shame, because a genuine B12 or folate deficiency is one of the more under-recognized contributors to fatigue and low mood.
The machinery behind your neurotransmitters
Folate and B12 drive the methylation cycle, which the body uses to build serotonin, dopamine and norepinephrine. When that machinery is short on parts, the first symptoms are often vague: tiredness, brain fog, flat mood — easy to attribute to “just being busy.”
Who’s most likely to be short
Vegans and vegetarians (B12 is mainly in animal foods), older adults (absorption declines with age), and people on long-term acid-reducing medication are all at elevated risk.
Active forms and sensible doses
Methylfolate and methylcobalamin are the “ready to use” forms and a good choice if absorption is a concern. You don’t need mega-doses — balanced is better, taken in the morning.
Our B-complex profile breaks down the forms worth paying for.