@discographer-- I use pure aloe vera gel for psoriasis and this is what I recommend. If you can't find this, a different product with other moisturizers can be used too. But make sure that the product is as natural as possible, without chemicals, fragrances and alcohol. These ingredients will aggravate psoriasis.
Aloe vera gel is great of the itching and dryness caused by psoriasis. But in my experience, it doesn't prevent the condition and might need to be combined with other treatments to keep psoriasis under control. Aloe vera gel has moisturizing and anti-inflammatory properties. But it doesn't inhibit the growth of skin cells, which is the issue with psoriasis.
So definitely use aloe vera, but realize that it will help with the symptoms only, it's not a permanent solution. You must use aloe vera regularly for the benefits to continue.