A cold wash is 'washing' with conditioner only. I may shampoo wash my hair maybe at most once a month, when the thought crosses my mind. For me that's a big no-no for my hair health as there are too many moisture stripping chemicals in some of these OTC produts. Folic Acid supplements you can probably find at a health care store like GNC or somewhere like that.
One thing that people with tightly coiled hair experience here is keeping our hair moisturized which is essential to healthy hair. This is going to sound wierd, but I haven't used hair grease in quite some time. I prefer liquid hair oils or natural shea butter to grease. Also as I stated in my earlier comment, Organic Root Stimulator products just seem to work great on my hair.