Hair Nutrition Deficiency Screener
Nutritional deficiencies are among the most common and most treatable causes of hair loss — yet they're often overlooked. This screener analyses your diet, symptoms, and lifestyle to identify the most likely nutrient suspects, ranked by probability. No blood tests required.
Answer all sections to get your ranked nutrient report
Think about your patterns over the past 3–6 months.
Hair is made of keratin — a protein. Low protein intake directly impairs hair growth.
Nails and hair share the same building blocks — nail changes often mirror what's happening in hair follicles.
Vitamin D is primarily made in skin from sunlight. Limited sun exposure is the #1 cause of vitamin D insufficiency.
Heavy menstrual bleeding is the most common cause of iron deficiency in women of reproductive age.
Why nutrition is the first place to look
Hair follicles are among the most metabolically active cells in the body — they're highly sensitive to nutritional deficits. Because hair growth is non-essential, the body deprioritises follicle nutrition during times of scarcity. This is why nutritional hair loss typically begins 2–4 months after a deficiency develops, and continues for months after correction.
Of all nutritional causes, low ferritin (stored iron) is the most common and most underdiagnosed in women. Many doctors use a serum ferritin cut-off that's too low for hair health — optimal ferritin for hair growth is generally considered to be above 70 ng/mL, yet labs often flag 12–15 ng/mL as "normal."