First, you need to know the cause off your hair loss. It may be stress, anxiety, nutrition factors... or genetic cause, also called androgenetic alopecia (which I have btw).
I've been doing a treatment that includes pills (Finasteride 1mg - helps to stop hair loss) and topic lotion aka Rogaine (5% Minoxidil) - helps growing new hair. It takes a few months to see the results, but it works! Also as soon as you stop doing it, your hair starts to fall again.Of course it's important to see a doctor before taking medicines.
There are some specific multivitamin complexes at drugstores that combines substances that help your hair growing stronger, such as biotin, queratin... A strong hair may not fall so easyly.
Take a look at this one: https://www.vitaminshoppe.com/p/hair-skin-nails-120-tablets/vs-2989
Since they're vitamins, I don't think it'd be a problem, and they could help your body and health and multiples ways