Studies on supplements such as biotin and folic acid are inconsistent with respect to effectiveness.
Hair loss shampoos may give the hair the appearance of looking fuller, but do not cause hair regrowth or prevent worsening hair loss.
Minoxidil (Rogaine®) 2% or 5% can safely and effectively treat a few causes of hair loss. People who have hereditary hair loss can have some regrowth with this product. You may not see results for 1 year.
At-home laser therapy (Devices are FDA cleared and you can buy them over the counter).