As far as I can see there are no published studies demonstrating the effect of topical or oral citrulline on hair growth. However there are several studies that have shown consumption of citrulline increases blood nitric oxide levels, which is thought to increase blood flow. But does it actually work?
Oleanolic Acid is a natural plant extract that seems to increase the growth factors VEGF and IGF-1. These growth factors are very important for hair growth, making this a very interesting plant extract for hair loss.
I was intrigued to learn that the Nanogen Growth Factor treatment contains Bitter Orange. Upon investigation, I learned that Bitter Orange increases PGE2. Increasing PGE2 in the scalp seems to increase hair growth.
Niacin is a B vitamin that is not toxic, even at high doses. When consumed in a particular form it causes blood to flush to the skin. We can use this flush to flood the scalp with hair growth nutrients.