Try not to pull your ponytail so tight, often pulling on our hair in this way be it through extreme styling or heavy extensions can cause issues like traction alopecia. Stress is also not helpful. Make sure you are getting enough sleep and are keeping hydrated.
If you are looking for a natural alternative BAMbeautiful (the brand I work for DISCLAIMER!) is really great and we have had an independent study conducted on our hero scalp tonic.
I've been dealing with thinning for awhile, and found this girl on youtube who's videos have helped me so much. Just thought I'd share and say youtube is a great place to find info. Best of luck to you!