Skin Boosters in Beverly Hills: What PRP, Polynucleotides, and Exosomes Actually Do

Walk into almost any dermatology practice in the 90210 zip code and you will hear the same three terms: PRP, polynucleotides, and exosomes. All three are sold as regenerative skin boosters, all three are injected or microneedled into the skin, and all three are frequently described with the same vague promise of glow. They are not interchangeable. They differ in what they contain, how they are regulated, and how much human evidence actually exists behind them.

Platelet rich plasma, the oldest of the three. PRP is made from the patient's own blood, spun in a centrifuge to concentrate platelets in plasma. When platelets are activated, they release growth factors including PDGF, TGF beta, VEGF, and EGF. These signaling proteins recruit fibroblasts, stimulate collagen synthesis, and promote angiogenesis, meaning new small blood vessel formation. Because PRP is autologous, meaning it comes from your own body, allergic reaction risk is essentially zero. The evidence base is the strongest of the three, particularly for androgenetic hair loss and as an adjunct to microneedling for acne scars and fine texture. The main limitation is variability. Platelet concentration depends on the patient's baseline blood values, the centrifuge protocol, and whether the preparation is leukocyte rich or leukocyte poor. Two patients receiving PRP at two different offices may receive meaningfully different products.

Polynucleotides, the newer European import. These are fragments of purified DNA, most commonly derived from salmon or trout sperm, processed to remove proteins that could trigger immune responses. The proposed mechanism is twofold. First, the DNA fragments act as a scaffold that binds water, improving hydration in the dermis. Second, as the fragments are broken down, they release nucleotides and nucleosides that cells can salvage for repair processes, which appears to support fibroblast activity and modulate inflammation. Published studies, mostly from Europe and Asia, show improvements in skin elasticity, hydration, and fine lines, and there is growing interest in their use around the eyes where hyaluronic acid fillers can cause puffiness. The honest caveat: the trials are generally small, often lack rigorous blinding, and regulatory status in the United States remains unsettled, so availability and labeling vary. Patients with fish allergies should disclose this, although purified preparations are designed to minimize allergenic proteins.

Exosomes, the most hyped and least regulated. Exosomes are nanoscale vesicles, roughly 30 to 150 nanometers, released by cells as a communication system. They carry proteins, lipids, messenger RNA, and microRNA that can alter the behavior of recipient cells. In laboratory and animal models, exosomes derived from stem cells have shown genuinely interesting effects on wound healing, collagen production, and inflammation. Here is the critical distinction that consumers rarely hear: in the United States, no exosome product is FDA approved for injection into skin for cosmetic purposes. The products used in aesthetic settings are typically applied topically after microneedling or laser resurfacing, and their sourcing varies widely, from human placental tissue to plant derived vesicles that are exosome adjacent at best. Quality control is a real concern because exosome content depends entirely on the parent cells and the manufacturing process, and independent testing of commercial products has found significant variability in vesicle concentration and purity.

How they compare in practice. For a patient with early hair thinning or post acne texture, PRP has the most reproducible track record and the cleanest safety story. For crepey under eye skin or overall dermal quality in someone who wants hydration without filler volume, polynucleotides occupy a plausible middle ground, with the understanding that the American evidence base is still catching up to the European one. Exosomes are best understood right now as a post procedure topical adjunct, potentially useful for calming inflammation after resurfacing, but not as a standalone injectable, and any office offering injected exosomes should raise questions.

Cost and cadence matter too. All three require series treatment. PRP protocols typically involve three to four sessions spaced about a month apart, then maintenance. Polynucleotide protocols usually run two to four sessions. Exosome applications are tied to whatever procedure they accompany. None of these delivers a one visit transformation, and any consultation that suggests otherwise deserves skepticism.

The bottom line. These treatments share a philosophy, stimulating the skin's own repair machinery rather than adding volume, and that philosophy is scientifically sound. But mechanism is not the same as proof. PRP has the trials, polynucleotides have promising but immature data, and exosomes have compelling biology with a regulatory and quality gap that patients should understand before paying premium prices. Ask what the product is, where it comes from, how it is prepared, and what published human evidence supports the specific use being proposed. A good clinician will answer all four questions without hesitation.

Related reading: Microneedling with PRP in Beverly Hills: What the 'Vampire Facial' Actually Does.