No, not "potions". Dr Lee is, just as you say, a dermatologist who is very much "up" on the science of hairloss.
He does sell minoxidil, he's most well known for his low-PPG minoxidil that dries in minutes and is a product that many on this forum use. He also sells some "designer minoxidil" with some additives that not everyone on this forum agrees with when it comes to proven efficacy. Nevertheless, I don't think that anyone would doubt his general knowledge of the science of hairloss, and he's a very kind man who has always been generous in answering any and every question that I've had via email on various facets of the hairloss equation.