CGF stands for two different things depending on the context: Chlorella Growth Factor, a nutritional extract from green algae, or Concentrated Growth Factor, a blood-derived material used in dentistry and oral surgery. Both are marketed for their regenerative properties, but they come from completely different sources and serve different purposes. Here’s what each one is and how it works.
Chlorella Growth Factor (the Supplement)
Chlorella Growth Factor is a water-soluble extract pulled from the inside of chlorella cells, a type of single-celled green algae. It’s rich in nucleotides, which are the small molecular building blocks your body uses to repair DNA and RNA. The extract also contains free amino acids like glutamate, alanine, tyrosine, tryptophan, and several others, along with short peptides and fragments of RNA.
The name “growth factor” comes from the observation that chlorella reproduces remarkably fast, dividing into four new cells roughly every 20 hours. CGF is the concentrated fraction of compounds thought to drive that rapid cell division. It doesn’t provide significant calories or macronutrients. Its value, at least in theory, lies in supplying small bioactive molecules that may support cellular repair and antioxidant defenses in the body.
What’s Actually in Chlorella Growth Factor
Lab analyses show that CGF is primarily made up of nucleotides: AMP, GMP, CMP, and UMP, plus related molecules like adenosine and guanosine. These are the same compounds your own cells use when building and repairing genetic material. The extract also contains low-molecular-weight RNA fragments and short chains of nucleotides called oligonucleotides.
Beyond nucleotides, CGF contains a mix of free amino acids and small peptides. Amino acids identified in the extract include glutamate, alanine, glycine, tyrosine, tryptophan, phenylalanine, methionine, valine, leucine, isoleucine, and proline. Some of these exist as nucleotide-peptide complexes, meaning they’re physically bound together inside the cell and only become available after the tough chlorella cell wall is broken open.
The quality of a CGF product is typically measured by something called the CGF index, which is based on how strongly the extract absorbs ultraviolet light at a specific wavelength (260 nm). Higher absorption means a greater concentration of nucleic acid-related compounds. Manufacturers sometimes use enzyme treatments to break apart the cell’s internal structures and release more of these compounds into solution, increasing the CGF index of the final product.
How CGF Supplements Are Used
CGF is sold as a liquid extract or in capsule form and marketed primarily for immune support, cellular repair, and general vitality. The proposed mechanism centers on dietary nucleotides. Your body can make its own nucleotides, but during periods of stress, illness, or rapid growth, demand may outpace supply. Supplemental nucleotides from CGF could, in principle, help fill that gap.
CGF-associated fractions have been reported to influence the body’s antioxidant pathways, which are the internal systems that neutralize harmful molecules called free radicals. This is the basis for many of the anti-aging and skin health claims attached to CGF supplements. However, most of the evidence for these benefits comes from cell studies and animal models rather than large human trials, so the strength of the claims remains limited.
Concentrated Growth Factor (the Dental Material)
In dentistry and oral surgery, CGF refers to something entirely different: Concentrated Growth Factor, an autologous biomaterial made from your own blood. A small blood sample is drawn, placed in a centrifuge, and spun at varying speeds to separate the components. The result is a fibrin membrane packed with platelets, growth factors, and immune signaling molecules called cytokines.
Because it comes from your own body, there’s no risk of rejection or allergic reaction. The fibrin membrane acts as a scaffold that releases growth factors gradually at the surgical site, promoting tissue repair over days rather than all at once.
How CGF Is Used in Dental Surgery
Oral surgeons most commonly use Concentrated Growth Factor after tooth extractions, particularly wisdom teeth. The CGF membrane is placed directly into the empty tooth socket, where it serves two purposes: it helps soft tissue close over the wound faster, and it encourages new bone to fill in the socket. This is especially important when a dental implant will eventually be placed in the same spot, since a well-preserved bone ridge makes implant surgery more predictable.
A systematic review of CGF use after third molar (wisdom tooth) extraction found that patients who received CGF experienced less postoperative pain and needed fewer painkillers compared to those who healed without it. Soft tissue healing was noticeably improved, and there were potential benefits in the amount of new bone that formed in the socket. The material has also been used in periodontal regeneration (rebuilding gum and bone around teeth) and alveolar ridge preservation, which is the process of maintaining jawbone volume after a tooth is lost.
Beyond extractions, CGF is applied in bone grafting procedures and sinus lifts, where it’s mixed with bone graft material to improve integration. The growth factors in the membrane help recruit the body’s own repair cells to the surgical site, which can shorten overall healing time.
Key Differences Between the Two
- Source: Chlorella Growth Factor comes from algae. Concentrated Growth Factor comes from your own blood.
- Form: Chlorella CGF is a dietary supplement (liquid or capsule). Dental CGF is a fibrin membrane prepared chairside during surgery.
- Purpose: Chlorella CGF is taken orally for general health. Dental CGF is applied directly to a surgical wound to accelerate healing.
- Evidence base: Dental CGF has stronger clinical support, with systematic reviews showing measurable benefits in pain reduction and tissue healing after oral surgery. Chlorella CGF has mostly preclinical data from lab and animal studies.
If you encountered the term CGF on a supplement label, you’re almost certainly looking at Chlorella Growth Factor. If your dentist or oral surgeon mentioned it before a procedure, they’re referring to Concentrated Growth Factor made from your blood. Despite sharing an abbreviation, the two have little in common beyond a general theme of promoting cellular repair.