Beekman has a way with serums, and the one you've heard of or have used before isn't even the best one, according to reviews ...
Mad Hippie Vitamin C Serum $27.99 at Amazon Mad Hippie Vitamin C Serum $33.99 at Ulta Mad Hippie’s vitamin C serum also uses sodium ascorbyl phosphate, but comes at a much lower price point.
An Ulta reviewer says ... What is the best way to apply a vitamin C serum? You can apply it in the morning and evenings, but if we had to choose, we’d suggest the former, since it helps ...