Hi
I use Glucomsamine, although my Rheumy says it's not worth it unless you take at least 1000 mg a day, and also Omega 3 (Eye Q), make sure you take a good quality Omega 3.
I knew someone who also had great results clearing her P with MSM
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Login for supplements - be careful with Holland and Barratt.
If you think it is PA you might want to do some research first before deciding on whether to go the soley on the alternative route.
http://psoriasis.uk.com/Psoriatic_Arthritis.html
I do hope it is not PA but nail P is the first sign of PA
Take care and let's know how you get on. 8-)