Hairloss can be genetic or it reflects medical problems which are treatable. The latter include:
1) Low IRON
2) Stress or Infection: Hair Loss and thinning can be seen 6-9 months after any severe stress or infection called "Telogen Effluvium". Hair grows back after 3-9 months after stress resolves.
3) Hormonal Imbalance: Low Thyroid can result in hair loss, if the hair loss is in front of the scalp, the cause could be excess testosterone (men) or too low in estrogen (women)
4) Autoimmune Dysfunction: If spotty bald patches, see dermatologist, this is caused by autoimmune related e.g: alopecia areata
1) Multi Nutrient powder
2) Iron, take an iron supplement until your ferritin blood test is over 100ng/ml
3) Biotin, can help strong hair or nails.
4) Saw palmetto for hair loss in front of the scalp for men
5) Minoxadil (rogaine) is sometimes modestly effective for localized hair loss, at a high cost but reasonably safe.