I just read skimmed this article several times,
http://www.fasebj.or.../23/7/2065.long
Senile hair graying: H2O2-mediated oxidative stress affects human hair color by blunting methionine sulfoxide repair
They say:
Accordingly, Met-S=O formation of Met residues, including Met 374 in the active site of tyrosinase, the key enzyme in melanogenesis, limits enzyme functionality, as evidenced by FT-Raman spectroscopy, computer simulation, and enzyme kinetics, which leads to gradual loss of hair color. Notably, under in vitro conditions, Met oxidation can be prevented by L-methionine.
There is a big problem with this analysis. They are using Methionine to prevent the oxidation of methione in an oxidizing environment. This will kind of work, if you have more methionine than H2O2, and if you are looking at the ratio of methionine to oxidized methionine. But if you are looking at the absolute value of the oxidized metionine, it is a monotonically increasing function the the amount of methionine and the amount of H2O2.
Morever metionine has no role in the functioning of Tyrosinase:
http://en.wikipedia....wiki/Tyrosinase
Tyrosinase catalyzes the change of Catechol into Quinone.
Oxidized Methionine (methionine sulfoxide) stops the enzyme from working.
To my ear, the solution is to reduce the amount of methionine, which will reduce the amount of methionine sulfoxide, increase the amount of other anti oxidants, like C60.
The only role I see for Methionine, is that it gets turned into Cystiene, which is a major component of hair:
http://www.ajichem.c...=397&h=219&as=1
So one should supplement Cystiene, and restrict Methionine.
In particular, I think a solution might be to mix C60 olive oil, with a small amount of DMSO, and use it as a hair tonic. The DMSO, should carry the C60-OO adduct into the skin, and the C60 should prevent the formation of H2O2, as well as neutralize any H2O2 which is there.