Our scalp blood supply is typically extensive and robust, being fed from multiple different directions and blood vessels. A healthy scalp can support thousands of transplanted hair follicle grafts without compromising blood supply at all, however, there are some considerations and limits for the number of follicles transferred. If the hair graft, or, “plug” is too large, or grafts are placed too close together, this can result in a poor hair survival rate. Large plugs and unnatural placement look less than ideal as well, however, and today’s modern FUE devices allow for very small grafts containing only 1 or 2 hairs to be placed through extremely small slits. The small hole created when the graft is removed will close and become indistinguishable within a few days. There is minimal trauma to the scalp and no incisions to stitch up.
Two things that can negatively affect the blood flow of your scalp are excess sun exposure and smoking. Nicotine constricts blood flow so is a terrible idea if you are having a hair transplant or any surgical procedure, because it delays wound healing and will not allow adequate nourishment of new follicles. For those who are active and enjoy spending time outdoors, sunlight can be hard to avoid, but this restriction will be key to a successful transplant. Talk to your surgeon about these considerations when planning your procedure.