Health topic
Common Nutrient Deficiencies
Which nutrient shortfalls are genuinely common, how they show up, and what the evidence says about correcting them with food and supplements — without turning normal variation into a diagnosis.
Real deficiencies matter — but so does not inventing them
A handful of deficiencies are genuinely widespread — vitamin D, iron, B12, iodine and magnesium among them — and correcting a true shortfall can make a real difference to energy, mood and long-term health.
The difficulty is that symptoms like tiredness or low mood are non-specific, and supplement marketing is quick to attribute them to whatever it happens to sell. A deficiency is best confirmed by intake, risk factors or a blood test — not guessed from a symptom list.
The reviews collected here explain who is actually at risk for each nutrient, how deficiency is identified, which foods and forms restore levels, and where more is not better — because several nutrients carry real risks in excess.
Browse the nutrient-deficiency library
Every review is evidence-graded. Refine by supplement type, goal, evidence strength and common concerns.
Nutrient deficiency articles
Reviews and guides on identifying and correcting common deficiencies.
Evidence reviews are on the way
We're building this section carefully — each guide goes through the same evidence-grading and safety review as the rest of Supplete. New articles will appear here as they're published.
Explore Supplement Facts →