There are a number of scientific studies which show that outdoor exercise is equally as good if not better than AD's for the cure of depression. This was part of my own programme in curing my own severe depression.
There is one product that I used (and still use) after trying many, which helped enormously and quite independently of the other measures I took, but apparently it is against the rules to advertise or mention any products for sale within Support Forums .
I have no affiliation/connection with the company who manufacture it.