I've never heard of that. This is my take on supplements... if you can afford them it can't hurt to at least give them a try. Sometimes the placebo effect will work for you.
but if its just a liquid, & doesnt contain any harmful chemicals, then it'll probably be ok to use. not sure if it'll have a affect on your hair though.
Chia, Flax and Hemp seeds are considered good for thickening hair because of their high fiber content so I guess it is possible that it will help you with your problem. I say it's worth a try.
All those suggestions above are great, but I think it's important to remember to pick one thing and stick with it, give it time to work and be patient before you experience results.
I have an uncle who swears by flaxseed oil and he says that it has been responsible for the new growth of hair on his head. I have also read a lot of positive things about it, so I'd say it's worth a try.
I'd stick to Rogaine. And maybe see an endocrinologist or a dermatologist if the issue is anything other than male pattern baldness (there are certain medical conditions that can cause hair thinning in women and getting treatment for them can often help a lot).