Biotin
I take the Biotin 1000 mcg and I take 3 a day in the evening before bed because Biotin also helps with carbohydrate metabolism. I have lost hair but fortunately I had a ton of it to begin with. So it is thinner but still looks good. I think it has stopped falling out now. I am 7 months out. I started losing at 3.5-4 months out.
I have taken Biotin for years when I wanted my hair to grow longer. I worked with Oncologists that recommended it to their chemo patients to slow hair loss and speed up new growth. Its cheap and effective. Bu****ch out, I have to shave my legs twice a day and pluck my eyebrows every 4 hours... Just kidding, but seems like it!!