[sabrota]

Lately I’ve been reading about patents darkening hair and skin at the pigmentation level.  In lots of patents L-phenylalanine ( precursor of tyrosine), tyrosine and/or L-dopa are involved ( as prescribed towards the end of the article:  http://www.cosmedix.com/skin-care-related-articles/skin-care-ingredients/chiral-skin-care )
I guess the right way to get it to the hair follicle/dermal papilla would be easier to darken.  I just need a good formula, Is there anyone who could help me?


Some links:

read 0013 http://www.faqs.org/patents/app/20100137238
http://www.freepatentsonline.com/y2004/0086471.html