I buy this product regularly and will continue to purchase it as for as long as it is available. I usually buy two 100g packs at a time as this can last me around 12 months and remains in-date before I need to re-order more. Personally I only tend to use it on my hands and feet for painful recurring dermatitis and this definitely works for me and keeps it under control.
IMO this product is much preferable to the alternative and long term use of prescribed steroid ointments etc.
This is the only product I know of which actually loosens the psoriasis on the scalp. If you follow it up with a good shampoo... It actually goes for a few days