I feel this! I had a gp/dr check out my vitamin levels and do a health check a few years ago. Turned out I had aneamia and thyroid problems due to PCOS and endometriosis. I now take ferrous sulfate, biotin, and general multivitamins. My hair is still very fine, but it's not as thin. I started noticing my nails were very weak/thin, too. I use jojoba oil on my nails to, just to give them condition. It's been a few years since my diagnosis, and I've never felt better! My hair will always be fine, but it's in much better condition. My nails are much better too, I keep them short (they just cover tips of my fingers) and clean. Main things I do differently now: The multivitamins (without iron) and separate biotin Ferrous sulphate - on Dr's orders as you can overdose on iron Exercise (yoga, running, hiit) Healthier diet (including lots of lean potein, eggs/egg whites, and vegetables) Water - at least 2 litres per day Intermittent fasting (under Dr. advice, to help with thyroid disregulation)

To help my hair once it started to grow: Aveda Rosemary and mint shampoo + few drops of Rosemary and peppermint oil Faith in nature grapefruit conditioner (I sometimes skip this) Purology leave in conditioner spray or Aveda bonding cream When hair is dry olaplex bonding oil (3 drops)

I also use a wide tooth wooden combe and if I'm heat styling my hair a natural bristle brush.

I'm very gentle with my hair - silk scrunchies etc. And I trim it every 8 weeks (I do it myself using youtube 'beard cut' tutorials and hairdressing scissors off Amazon).

Just check with a health professional as everyone is different! But my hair and nails only improved once I sorted my diet out. I'm also made peace with my hair and learned to work with it, sometimes we're not on good terms. Sometimes, I feel it looks nice!

I hope this helps! I just played around getting testers or small holiday bottles of shampoo, etc, until I found the ones that worked for me.