Renuva is made from donated human fat tissue that has been processed to remove all living cells, leaving behind only the structural framework (called an extracellular matrix) of the original fat. This matrix is what gives the product its unique ability to encourage your body to grow new fat cells at the injection site, rather than simply filling space the way traditional dermal fillers do.
The Core Ingredients
The base material is adipose (fat) tissue recovered from deceased human donors. Through a process called decellularization, all of the donor’s living cells are stripped away. What remains is a complex scaffold made up of proteins and structural molecules that naturally exist in fat tissue: several types of collagen, laminin, fibronectin, and sulfated glycosaminoglycans. These aren’t synthetic additives. They’re the same components that make up the connective framework of your own fat.
Because the cellular material is completely removed, the final product carries no living donor cells and no DNA. It functions purely as a biological scaffold, a protein-rich template that your body recognizes as a familiar environment for fat growth.
How the Matrix Is Processed
Renuva is manufactured by MTF Biologics, a nonprofit tissue bank. The donor tissue is recovered and screened in accordance with American Association of Tissue Banks and FDA regulations. The material is then aseptically processed (meaning it’s handled in sterile conditions throughout) and chemically disinfected to reach a sterility assurance level equivalent to one in a million chance of a non-sterile unit. It does not undergo terminal sterilization, which can damage delicate biological structures.
Every lot, which comes from a single donor, must pass both sterility testing and bacterial endotoxin screening before it can be released. The product has also passed the full ISO 10993 biocompatibility testing panel, a standard suite of tests that evaluates whether an implanted material causes irritation, toxicity, or allergic reactions in tissue.
How It Differs From Traditional Fillers
Most injectable fillers use synthetic or semi-synthetic materials like hyaluronic acid to physically occupy space under the skin. They provide immediate volume but are gradually broken down and absorbed by the body over months, requiring repeat treatments.
Renuva works on a fundamentally different principle. Instead of filling space itself, the matrix acts as a set of biological instructions. The retained proteins and structural cues mimic the natural microenvironment of fat tissue, which recruits your body’s own stem cells and pre-fat cells to the area. These cells then differentiate into mature fat cells, supported by new blood vessel growth. The scaffold essentially tells your body, “build fat here,” and then gets replaced by living tissue.
This process is gradual. In clinical biopsies, the injected matrix was still visually distinct from surrounding fat at one and three months. By six months, the material had remodeled and was primarily composed of new, functioning fat cells. It was visually indistinguishable from the patient’s own native fat. Volume was maintained through that six-month window, with increasing density of new fat cells at each check-in.
What the Injection Feels Like Over Time
Because Renuva is a biological scaffold rather than a gel filler, the texture changes as it integrates. Immediately after injection, the material is palpable under the skin. It softens progressively, and by about three months most patients can no longer distinguish the treated area by touch. This timeline reflects the transition from scaffold material to living fat tissue.
The trade-off for this natural end result is patience. Unlike hyaluronic acid fillers that plump instantly, Renuva’s full effect takes several months to develop as your body completes the regeneration process.
Where It Can and Cannot Be Used
Renuva is intended for areas where fat naturally exists. Common treatment sites include the cheeks, jawline (prejowl area), hands, and body contour defects where fat has been lost due to aging, injury, or prior surgery. It’s specifically designed to replace or supplement damaged or inadequate fat tissue in these areas.
There are two clear contraindications. It should not be injected into areas where native fat doesn’t normally exist, since the surrounding tissue environment is essential for triggering fat cell growth. It’s also contraindicated for patients with a history of anaphylaxis or severe allergic sensitivity. Because the product is derived from human donor tissue, even though it’s thoroughly processed, patients with significant allergy histories may not be appropriate candidates.
Why Donor Tissue Instead of Synthetic Materials
The reason Renuva uses processed human fat rather than a lab-created material comes down to complexity. Fat tissue’s natural scaffold contains a specific combination of proteins and structural molecules that synthetic materials haven’t been able to fully replicate. Even after decellularization reduces the concentration of these components compared to living tissue, the remaining mix still provides the biochemical signals needed to drive fat cell growth, blood vessel formation, and healthy tissue remodeling while minimizing scarring and inflammatory responses.
In practical terms, this means the end result is actual fat tissue, not a foreign substance your body tolerates. The regenerated fat behaves like any other fat in your body. It will change with weight fluctuations and age naturally with the rest of your tissue.