Hair lost and dying my hair

I am 4 1/2 months post-op RNY and have been loosing some hair for the last month or two. A month ago I began taking Biotin and folic acid as some of you guys recommended. I take one folic acid a day and 2 biotin, is this enough? Also I have an appointment on Tuesday to retouch some highlights and new growth. Is this okay? Has anyone done this and what difference did it make on the hair lost? I hope not much!! Thank you! Carmen

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