You may want to try eclipta alba. It is an ayurvedic herb that darkens hair. You can buy it in a hair oil. I have never used it myself, I just came across it while researching herbs. If you do try it, please post results. I may put some in my husband's shampoo.
Originally Posted by CurlyFireHorse
Thanks for your reply, I will have to look this up.
Upper Michigan Dews
3a ~ Fine ~ High Porosity ~ Normal Density

NoPoo: JC Cleansing Cream
Rinse Outs: SS:PRT, CJ Repair Me, CJ Argan
Detangler: KCKT
Leave-in: CJ Repair me
Stylers: UFDCM, BRHG
Refreshers: Batiste (dry shampoo) on the roots & UFDCM everywhere else

iHerb Discount Code: SAF007