This diet/supplements regime cleared my skin of all psoriasis

HeAbsolutely NO smoking! It really makes it worse.
NO alcohol

Absolutely NO sugar AT ALL. So that's no fruit sugar either. No fruit or fruit juice. If I have any fruit, the condition returns. 

Every day, morning and night, I have 200gms of Yeo Valley organic, natural, probiotic yoghurt. (NOTE - NO sugar!) This is to flood the gut with good flora. 

Daily Supplements:

2 x Bio-Kult Candea capsules. (Again for gut flora)
1 x high strength Milk Thistle 350gms at 80% silymarins 
1 x ultra high strength 5MG Biotin (from Nature's Remedy) - this stuff makes the gut flora healthy - it uses it to construct itself.
gel Psorgen