I use the phytocane revitalizing serum. On the box it says it's for hair loss due to stress, diet, fatigue, pregnancy.
It's really lovely and kind of glamorous to use. It comes as 12 amber glass ampules, you crack the top off, stick on the plastic applicator and massage the serum directly onto your scalp after a shower. I love the scent and it leaves my hair really soft and volumized. It's expensive but I found it to be quite effective. I personally didn't take biotin post op because I had tried it years ago and ended up growing some unwanted body hair.