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I just found this on another forum:
In a test of the effectiveness of the invention, four middle-aged males with rapidly progressing baldness were treated orally with either 6g of evening primrose oil or 6g of a mixture of evening primrose oil and concentrated fish oil (20%) per day. The primrose oil provided approximately 90mg of 18:3n-6 (gamma-linolenic acid, GLA) per gram and the fish oil 180mg of 20:5n-3 (eicosapentaenoic acid, EPA) and 120mg of docosahexaenoic acid (DHA) per gram. After delays of 4 to 8 weeks, all four individuals reported unequivocal hair growth, with extension of hair growth to previously bald areas of the scalp, and a strengthening of growth in those areas where hair was present but thinning. Topical application of the unsaturated fatty acids provides better results by increasing the concentration of the fatty acid at the hair follicle level.
In further tests, one male applied pure evening primrose oil twice per day to half the beard area. After about two weeks, the rate of beard growth on the side of the face to which the oil had been applied was definitely less than on the other side. Similarly, one female shaved both legs and then applied evening primrose oil twice daily to one leg only. After a period of 6-8 weeks it could be seen that the rate of hair growth was substantially less on the leg to which the oil had been applied.
These preliminary tests indicate that both oral and topical application of unsaturated fatty acids is able to modulate the actions of androgens on the hair follicles, stimulating hair growth on the scalp and reducing it on other areas of the body.