How does SVF help fat grafts survive?

Grafted fat has to survive until a blood supply forms around it. A 2026 review of fat graft survival describes one proposed mechanism for adipose-derived stem cells. They mainly release secreted factors that support angiogenesis and protect the grafted tissue, rather than differentiating into new fat cells[3]. Cell-assisted lipotransfer (CAL) relies on this idea: SVF is mixed into the fat before it is injected. A 2024 systematic review in Aesthetic Plastic Surgery assessed how effective CAL is[4].

SVF is a mixed cell population. Stromal/stem cells are a minority of it, alongside endothelial cells, pericytes, immune cells and fibroblasts[1]. As a result, the number of active cells delivered varies with the harvest, the processing method and the dose. The ISSCR cautions that processing can alter cell function, so each use needs its own safety and efficacy data[1]. A 2026 safety review found that reported adverse events with autologous SVF are mostly related to the harvesting and injection procedures[2].

There is limited randomized controlled evidence, and results should not be generalized across indications. Useful questions for a specialist include how the SVF is prepared, how many cells are added, and what outcome data exist for the planned procedure.