Has he had the dandruff diagnosed and is it seborrhoeic dermatitis? If so the obvious solution for that and possible to help the thinning is Regenepure shampoo which contains ketoconazole and various growth ingredients but is sulphate free. However that is not one step. If the issue is not SD then Head & Shoulders is not only useless but potentially damaging, it's a very harsh line.
Cleansing conditioners and dermatitis are not always the best of friends, you could worsen the issue on quitting sulphates (these make skin thinner, more easily irritated, thinner, destroy the protective skin flora). Most commercial products are loaded with potential irritants - from oleic rich oils to fragrance to preservatives. If he does have SD and you do go that route look for something with few ingredients but including tea tree oil.
Also if you live together review your diet making it as anti inflammatory and nutrient dense as possible, this gives you the best chance of healthy growth, also can alter the amount and composition of the sebum, reduce systemic inflammation and strengthen the skin barrier. Particularly look at intake of oily fish, low sugar fruit, non starchy vegetables, sugar and white/ refined carbs. Inflammation is implicated in some forms of hair loss not just dermatitis.
2a-2c, medium texture, porous/ colour treated. Three years CG, growing out mechanical and chemical damage = breakage and very high porosity. Past armpit length heading for waist.
Treatments: Komaza protein, Komaza Matani, coconut oil with sugar syrup. Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume
Styler: Umberto Giannini jelly, Boots curl creme, Rockin RInglets
Experimenting with: Mega-Tek, Curl Harmony reviver, Elvive Full Restore 5.
Last edited by Firefox7275; 08-26-2013 at 08:20 AM.