I frequently use P&S Shampoo, it's my favorite. However, it's been on backorder in my area for something like five months now so I've started using DHS, and that works fine, too. Both are available by asking the pharmacist. You don't need a prescription but they usually keep it behind the counter so you have to ask. The DHS is much more resonably priced than the P&S. I don't know if it's equally effective or not, but in a month I should know. I do know that the DHS is much less expensive than the P&S.
T-Gel is sorta ok in my opinion, but not as good as the other two. Plus, it's smelly and it makes my hair color darken. I might like that as I get more grey hair, but right now that's not a big problem. Let's all cross our fingers that it stays that way for several more years!
I am female, and was born in 1972 with Lamellar Ichthyosis.