Determining if you have a selenium deficiency and need supplementation is a complex process that requires a look at a patient’s medical history and a physical examination.
However, some things that may hint at a selenium deficiency include (19):
Joint swelling, tenderness, or restricted movement
Neurological function problems such as sensory perception, reflexes, and coordination issues
Skin pigmentation changes, white spots on nails, or brittle nails
Male infertility
Menstrual irregularities or other reproductive issues in women
Growth disorders in children