What it is
Adipose tissue is body fat. It contains many cell types, including fat cells, supportive connective tissue, blood vessel cells and a population of cells often called adipose-derived stromal or mesenchymal cells. When people say fat stem cell injection, they usually mean a procedure that collects fat, often by a minor liposuction-type collection, and prepares it for use elsewhere in the body.
Several different things fall under this label. Stromal vascular fraction (SVF) is a mixture of cells separated from fat, often using enzymes or mechanical steps. Microfragmented adipose tissue is fat that has been broken into smaller pieces without being separated into individual cells, and Lipogems is a well-known brand name for one such system. Some clinics also culture or expand cells, which is a further level of processing.
Processing matters because of regulation. In the U.S., the only FDA-approved stem-cell products are cord-blood-derived hematopoietic progenitor cell (HPC) products for certain blood and immune disorders, used in specialist transplant settings. Adipose-derived cell products, including SVF, microfragmented fat and exosomes, are not FDA-approved for treating joint or other conditions, and the FDA has warned the public about unapproved stem cell and exosome products. No exosome product is FDA-approved.
How it’s traditionally been approached
Fat has long been used in reconstructive and cosmetic surgery as a filler and a source of soft tissue. Using a person's own tissue in the same procedure, sometimes called autologous use, is the idea behind many of the newer approaches. Interest grew as researchers began studying the cells found within fat.
For joint concerns, people have traditionally worked with licensed clinicians on approaches such as activity changes, physical therapy, bracing, medications, injections that are already established, and in some cases surgery. Adipose-derived cell procedures are often described as an option people explore alongside or after these, but the evidence for them is limited or still investigational.
Comparisons between adipose and bone marrow sources come up often. Both are tissues from which cells can be collected, and they differ in how they are collected and what they contain. Whether either is appropriate for a particular person is a question only a licensed clinician can answer after an evaluation, and neither use is FDA-approved for joint conditions.
How the right provider may help
The right provider may help you sort through the terminology and understand what is actually being offered. A visit generally begins with a conversation about your history, your current concerns and what you have already tried, and may include an exam and a review of any imaging. A good provider will be comfortable explaining the alternatives, including the option of not pursuing a cell procedure.
Useful questions include: What exactly is being collected and how is it processed? Is this product FDA-approved or is it being offered as unapproved? Is it part of a study registered on ClinicalTrials.gov with IRB oversight? What are the risks, the alternatives and the limits of the current evidence? You can also ask the provider to explain, in plain language, what they cannot promise.
Before agreeing to anything, verify the clinician's license with your state medical board and ask for written informed consent that covers risks and alternatives. Watch for red flags: claims that a treatment cures or works for everything, being asked to pay to join a clinical trial, testimonials offered in place of evidence, and pressure to travel abroad or across states. Calling a treatment holistic or alternative does not change its FDA status.
The whole-person view
Body, mind and stress affect each other. Ongoing pain or limited movement can weigh on mood, sleep and confidence, and stress can in turn make the body feel more tense and sensitive. Looking at the whole person, including movement, rest, relationships and daily routines, is part of how many people approach long-term concerns.
Some people find that body-based support such as Somatic Experiences helps them build awareness of tension and stress in the body. Others find talk therapy through Therapists.plus useful for coping with the frustration and uncertainty that can come with persistent symptoms. These are possible supports, not substitutes for care from a licensed medical professional.
Somatic Experiences: embodiment and movement →Somatic Experiences: nervous system regulation →Therapists.plus: mind body connection →
Keep in mind
- In the U.S., the only FDA-approved stem-cell products are cord-blood-derived HPC products for certain blood and immune disorders; adipose, SVF, microfragmented fat and exosome products used in clinics are not FDA-approved for joint conditions.
- Evidence for fat-derived cell procedures is limited or investigational, and no outcome can be promised, so talk with a licensed clinician about your own situation and options.
- Serious or worsening conditions should be guided by licensed professionals. For emergencies call 911, and in a crisis call or text 988.
- This page is educational only and is not medical advice; always verify FDA status, ClinicalTrials.gov registration and the clinician's license before deciding.
Guides in this topic
Provider types
Frequently asked questions
What is a fat stem cell injection?
A fat stem cell injection is a procedure in which a person's own fat tissue is collected, processed and then placed in another part of the body, such as near a joint. In the U.S., these adipose-derived products are not FDA-approved for treating joint conditions. A licensed clinician can explain what a specific offering involves and what is known about it.
What is stromal vascular fraction (SVF)?
Stromal vascular fraction is a mixture of cells separated from fat tissue, often using enzymes or mechanical processing. It contains several cell types, not only stem cells. SVF products used in clinics are not FDA-approved, and the FDA has warned the public about unapproved stem cell products.
What is microfragmented adipose tissue, and what is the Lipogems procedure?
Microfragmented adipose tissue is fat that has been broken into smaller pieces while keeping much of its natural structure. Lipogems is a brand name for one system that does this. Ask a provider about the FDA status of any such use for joints, because it is not approved for treating joint conditions and evidence is limited.
Why does processing change FDA status?
Processing can change how the FDA classifies a product. Tissue that is only minimally handled and used in the same procedure may be regulated differently than tissue that is separated, enzymatically treated or grown, which is generally treated as a drug or biologic needing approval. Ask your provider to explain how they believe their product is regulated, and verify it yourself.
What is the difference between adipose and bone marrow stem cells?
They are cells collected from different tissues, fat versus bone marrow, using different collection methods, and they differ in what they contain. Neither is FDA-approved for joint conditions, and evidence for both is limited or investigational. A licensed clinician can discuss whether either is appropriate after an evaluation.
How can I check whether a fat stem cell clinic is trustworthy?
Start by verifying the clinician's license with your state medical board and asking whether the product is FDA-approved. Check that any study is registered on ClinicalTrials.gov with IRB oversight, and get written informed consent covering risks and alternatives. Be cautious of cure-all claims, fees to join a trial, testimonials in place of evidence, and pressure to travel.
Educational resource. StemCell.biz shares general information and connects people with independent providers. It is not medical advice, diagnosis or treatment. Talk with a licensed professional about your health.