Chronic fatigue and exhaustion: which vitamin deficiencies should be checked?

What to know

The most common picture looks like this: months of feeling flat, more coffee, sleep that doesn’t refresh. Then the blood panel shows ferritin under 30 and vitamin D around 20 ng/mL — both technically ‘within range’, both far from optimal. That gap between ‘normal’ and ‘good’ is the most overlooked point in chronic fatigue.

This is also where form starts to matter: methylcobalamin over cyanocobalamin for B12, bisglycinate over oxide for magnesium, and a gentle iron bisglycinate chelate for absorption. Two products with the same name on the label can deliver completely different results because of the form inside.

Watch out for the money trap: ‘energy complex’ blends with dozens of ingredients usually contain a little of everything and enough of nothing. Taking exactly what you lack, in the right form and a meaningful dose, is both cheaper and more effective.

My approach: fix deficiencies first, avoiding unnecessary medication load wherever possible. Persistent or worsening fatigue needs a doctor first; if you take any medication, never stop it on your own.