My current condition [pics] - what can be done?

[Preservationist]

Hey there.
I am 33 and have had this hairline for the longest time. It is progressing but at a very slow rate. A few years back I was looking into some treatments but I gave up on it. Now I am more determined (too late?) My hair is pretty fine. I get psoriasis quite often so I use tar/Salicylic acid shampoo almost exclusively. The side of my head are getting pretty grey as well. That has been also happening for years but now progressing even more. For styling I use FRUCTIS power putty and their hair anti-humidity hairspray. Other products cause irritation.

I am very healthy person. My diet is good - lean meat and veggies, smoothies. I eat very little processed foods. No illnesses. Non-smoker. I exercise regularly and get enough sleep.

I would like to slow down the hair loss and regrow some hair. Especially on the upper left side where there is less hair than on the upper right side. I would like to try products that have no side effects. What treatments/regimens do you suggest for me?