Although the most common cause of hair loss is androgenetic alopecia (or androgen-related hair loss), there are multiple "other causes" for hair loss, particularly in women. These other causes (just to name a few) include thyroid disorders, low iron or vitamin deficiencies, anemia, certain medications, autoimmune conditions (such as alopecia areata), and scarring conditions of the scalp. These are relative uncommon causes for hair loss, but the treatment varies for each of these conditions. It is doubtful that probiotics is the cause for your hair loss. But if you are at all concerned about the probiotics, I would stop taking them. A proper history and physical exam by a hair expert is necessary to determine the actual cause of your hair loss. Once the actual cause of hair loss is determined, appropriate treatment can be administered.