Donor fat injections to the face

Donor fat matrix has been studied in very few people. A systematic review found 10 human studies with 93 patients across the face, hands, feet and body, with volume retention anywhere from about 22% to 100% [1]. The main facial study followed 11 women for 24 weeks and reported fuller midfaces and higher satisfaction, without a comparison group [2]. Its authors and other industry-linked reports describe the product as nonimmunogenic, yet severe reactions like Bryan Johnson's show it can still trigger the immune system.

More is known about the risks of facial injections in general. Any filler pushed into a blood vessel can block it, and published cases of vision loss after facial fillers keep growing, with the nose, forehead and frown lines at highest risk [3] [4]. Fat grafts using the patient's own fat can form lumps, oil cysts and areas of dead fat, most often around the eyes [5].

No trial has compared donor fat with hyaluronic acid fillers or with the patient's own fat, and long-term data are scarce.

• Common effects are redness, swelling, pain and burning at the injection sites for days to weeks.
• Allergic or immune reactions can occur, including severe swelling of the face.
• Injection into a blood vessel is rare but can cause skin death, blindness or stroke, so only trained injectors who know facial anatomy should do it.
• Donor fat matrix is sold in the US as processed human tissue rather than as an FDA-approved filler, so it has not gone through the trials that approved fillers need.
• People with active skin infections, autoimmune disease or past reactions to fillers or tissue grafts should ask a doctor first.