Restoria Lotion. Restoria for men works with the natural chemistry of the hair to gradually reduce grey hair, returning it to a natural looking colour. Most products for grey hair are instant dyes but because Restoria returns colour to hair over a period of two to three weeks you avoid the embarrassment caused by a sudden and dramatic change in hair colour. Restoria is simple to use, requires no mixing and causes no mess simply apply where necessary to dry hair and comb through. After the desired colour has been achieved it need only be applied once or twice a week.