Common reasons for hair fall in women
- Female-pattern hair loss: gradual thinning over the crown or widening of the central part.
- Telogen effluvium: increased shedding after illness, fever, surgery, childbirth, severe stress, rapid weight loss or marked calorie restriction.
- Iron deficiency: more likely with heavy menstrual bleeding, pregnancy, restrictive diets or gastrointestinal blood loss.
- Thyroid disease: both underactive and overactive thyroid states can disturb the normal hair-growth cycle.
- PCOS/PMOS and androgen excess: may cause scalp thinning together with acne, irregular cycles or increased facial hair.
- Scalp or autoimmune disease: patchy loss, scaling, inflammation or scarring needs dermatological examination.
- Medicines, traction and hair practices: some medicines, tight hairstyles, chemical treatments and repeated heat can contribute.
Ingredients worth understanding in a hair or nail nutraceutical
Protein and essential amino acids
Hair is made largely of keratin, a protein. Inadequate protein or severe calorie restriction can trigger shedding. The first solution is adequate dietary protein; adding amino acids to a supplement cannot compensate for an overall inadequate diet.
Iron
Iron supports haemoglobin and rapidly dividing cells, including those in the hair follicle. Iron deficiency can contribute to fatigue and hair shedding, but iron should not be taken blindly. A blood count and iron studies may be appropriate when history suggests deficiency; excess iron can be harmful.
Zinc
Zinc is involved in cell growth and tissue repair. Deficiency can cause hair loss, but routine high-dose zinc is not a universal hair treatment and can produce copper deficiency or other adverse effects.
Vitamin D
Low vitamin D is common and has been associated with some hair disorders, but association does not prove that supplementation regrows hair in everyone. Replacement is most defensible when deficiency is established or the patient has another clinical indication.
Biotin
True biotin deficiency can cause hair loss and brittle nails, but it is uncommon. Evidence for high-dose biotin in people without deficiency is weak. High-dose biotin can also interfere with thyroid, hormone, vitamin D and cardiac laboratory tests, producing misleading results.
Vitamin B12, folate and other nutrients
These nutrients matter when a deficiency or related anaemia exists. They should be selected according to diet, symptoms, medicines and laboratory results rather than added automatically to every “hair formula.”
What a sensible medical assessment may include
The pattern and timing of hair loss guide testing. Depending on the history, assessment may include scalp examination, complete blood count, ferritin or iron studies, thyroid testing, nutrition review and evaluation for PCOS/PMOS or androgen excess. Sudden patches, scalp pain, redness, scaling or scarring should prompt dermatology review.
Why nails may also change
Brittle or spoon-shaped nails can occur with iron deficiency, while many nail problems are caused by repeated wet work, trauma, skin disease or infection. Biotin is widely marketed for nails, but current evidence is limited and does not justify assuming that every brittle nail is a biotin deficiency.
Primary sources
- American Academy of Dermatology: Hair loss diagnosis and treatment, accessed July 2026.
- American Academy of Dermatology: Hair-loss self-care and supplement cautions, accessed July 2026.
- NIH Office of Dietary Supplements: Biotin fact sheet, accessed July 2026.
- NIH Office of Dietary Supplements: Iron fact sheet, accessed July 2026.
This article is educational and is not a diagnosis or a recommendation to start a supplement. Pregnancy, chronic illness and interactions with medicines can change what is safe.