Advanced Skin Rejuvenation: Skin Boosters, Polynucleotides, and Microneedling Mesotherapy

Introduction

It is important to integrate skin booster treatments into a broader skincare strategy. As Dr. Ahmed Haq of CosmeDocs explains, "each product and service has a role, like a pyramid of skin rejuvenation where on the bottom, most important sit cosmeceuticals like retinoids and antioxidants, followed by treatments to make skin smoother (exfoliants – the 'paint removers') and then, to thicken the skin, the dermal boosters."

This pyramid approach highlights that:

• Cosmeceuticals (Base): Topical retinoids, antioxidants, and SPF form the foundation for skin health and rejuvenation.
• Exfoliation (Middle): Procedures like chemical peels or resurfacing smooth the skin surface by removing dull, damaged outer layers.
• Dermal Boosters (Top): Injectables strengthen and thicken the dermis, enhancing elasticity and hydration from within.

This review focuses on the top of the pyramid – advanced injectable and device-based therapies for skin rejuvenation – examining their biochemical mechanisms, clinical efficacy, and patient outcomes based on current evidence.

Hyaluronic Acid Skin Boosters

Hyaluronic acid (HA) is the most established skin booster ingredient, given its key role in dermal hydration and structural support. Unlike traditional HA dermal fillers that are heavily cross-linked and injected deeper for volumising, HA skin boosters typically use lightly cross-linked or non-cross-linked HA gels injected superficially into the intradermal layer. The primary intent is not to create volume, but to improve skin texture, elasticity, and hydration by restoring the extracellular matrix (ECM) milieu.

Mechanisms of Action

Beyond passive hydration, HA boosters actively engage cellular pathways. Injected HA can mechanically stretch the dermis and interact with HA receptors on fibroblasts (CD44 and CD168), triggering a wound-healing cascade. This stimulates transforming growth factor-beta (TGF-β) signalling, which increases type I collagen production by fibroblasts. HA also inhibits collagenase enzymes, slowing collagen breakdown.

The net effect is not only hydration but also neocollagenesis – particularly Type I collagen deposition in the dermis – and promotion of elastin, leading to improved skin firmness and elasticity.

Cross-linked vs. Non-Cross-linked HA

Cross-linked HA boosters (e.g. Restylane Vital, Juvéderm Volite, Stylage® HydroMax) contain chemically cross-linked HA to prolong residence time in skin. Clinical consensus has favoured lightly cross-linked HA boosters as a first-line injectable for skin hydration. Studies show that intradermal micro-boluses of cross-linked HA produce diffuse, homogeneous improvement in dermal ECM structure.

Non-cross-linked HA formulations tend to diffuse quickly and be degraded faster by hyaluronidase. They provide transient hydration but have shown inconsistent results due to their short-lived presence.

Profhilo® – A Novel Hybrid HA Booster

Profhilo deserves special mention as a unique HA injectable that is neither conventionally cross-linked nor purely fluid HA. It consists of a high concentration of HA (64 mg total per 2 mL) formulated as Hybrid Cooperative Complexes (HCC) of low- and high-molecular-weight HA, stabilised by a thermal process rather than chemical cross-linkers (no BDDE).

Profhilo is injected with a specialised five-point technique per side (BioAesthetic Points), releasing 0.2 mL boluses that flow and diffuse through the dermal planes to bio-remodel the skin. The manufacturer and independent researchers report that Profhilo acts by "bioremodelling": restoring physiological dermal architecture and reversing laxity by stimulating fibroblasts, keratinocytes, and adipocytes to regenerate the extracellular matrix.

Polynucleotide Injectables (PDRN/PN)

Another class of skin boosters attracting growing interest is polynucleotide (PN) injectables, which are essentially DNA-derived products. Polydeoxyribonucleotide (PDRN) and Polynucleotides (PN) refer to DNA polymers typically extracted and purified from fish sources (such as salmon sperm or trout milt).

PDRN comprises shorter chains (50–2000 base pairs) whereas PN refers to higher molecular weight DNA strands; both have regenerative properties, but PN's longer chains give it greater viscoelasticity and water-binding capacity, allowing it to form a gel-like scaffold in tissue.

Mechanisms of Action

Polynucleotides are biostimulatory agents that work via several pathways:

• Tissue Repair and Fibroblast Activation: PDRN acts as an agonist of the A2A adenosine receptor, stimulating tissue repair and providing anti-inflammatory effects.
• Scaffold and Hydration: Long-chain DNA in PN forms a 3D porous matrix in the dermis that supports cell migration and binds water.
• Anti-Inflammatory Modulation: PN and PDRN scavenge free radicals, reduce inflammatory cytokines, and promote microcirculation and angiogenesis.

Clinical Evidence

In a Korean study of female patients who received four PN treatments at 2-week intervals, objective measurements showed significant improvements in skin thickness, elasticity, pore size, pigmentation, and wrinkle depth with no serious side effects. Similarly, a European trial found dermal quality enhancement and reduction of atrophic acne scars after a course of PN injections.

Notably, in split-face trials for periorbital rejuvenation, PN injections outperformed non-crosslinked HA in improving fine wrinkles (crow's feet) and elasticity around the eyes, suggesting polynucleotides may have a more potent biostimulatory effect in certain contexts.

Microneedling with Mesotherapy

Microneedling, also known as percutaneous collagen induction therapy, is a device-based treatment where a pen or roller with fine needles creates numerous micro-punctures in the skin. This controlled wounding triggers the skin's natural healing cascade, leading to regeneration.

When needles penetrate the skin's surface, they set off a complex wound-healing process. Platelets and keratinocytes release growth factors (PDGF, TGF-α, TGF-β, VEGF) which activate dermal fibroblasts. The fibroblasts ramp up production of collagen (types I and III), elastin, and glycosaminoglycans as part of the repair process.

Clinical Efficacy

Microneedling has a well-established record in treating acne scars, fine lines, and skin texture irregularities. A recent split-face study compared traditional needle mesotherapy versus microneedling mesotherapy in 20 women. Both sides showed significant anti-aging improvements, but each technique had advantages:

• Microneedling side had greater improvement in hydration and sebum balance (and was reported as less painful)
• Needle-injection side had larger reduction in hyperpigmentation
• Both improved skin firmness and elasticity, with slightly more elasticity gain noted with microneedling

For practitioners interested in expanding their skin treatment offerings, the Microneedling Training Course provides comprehensive protocols for various indications.

Clinical Integration and Practice

For an aesthetic practitioner, the toolkit for skin rejuvenation now includes a spectrum from topicals to injectables and devices. The art is in selecting the right combination for each patient's skin needs and aging stage. A holistic plan might involve:

• Optimising skincare (retinoids, antioxidants, SPF)
• Performing periodic peels or laser for resurfacing
• Using injectable treatments (HA boosters or polynucleotides) to rebuild dermal support

The treatments discussed are not mutually exclusive – they often work best in complementary harmony. For example, a middle-aged patient with early laxity and dull skin might undergo Profhilo injections for deep hydration and tightening, plus microneedling with vitamin C to brighten and smooth the surface.

Conclusion

Skin boosters, polynucleotide injectables, and microneedling mesotherapy represent advanced, evidence-backed strategies to rejuvenate the skin from within. They each stimulate the skin's biology in distinct but overlapping ways – from HA's water-binding and fibroblast-stretching action, to PN's regenerative DNA signalling, to microneedling's collagen induction.

High-quality studies demonstrate that these treatments can increase collagen (Type I and III) and elastin content in the dermis, restore hydration and epidermal barrier function, and clinically improve fine lines, texture, and elasticity. Safety profiles are excellent, with minimal transient side effects in the vast majority of patients.

The new era of skin rejuvenation is not about one miracle cure, but about a strategic, layered approach that leverages the best of biochemistry and technology to help patients achieve healthy, youthful skin.

References

1. Skin boosters: Definitions and varied classifications. PMC
2. Injectable "Skin Boosters" in Aging Skin Rejuvenation: A Current Overview. PMC
3. Hyaluronic Acid Hybrid Cooperative Complexes: Update on Safety Assessment. PubMed
4. Efficacy of Needle and Microneedle Mesotherapy in Reducing Signs of Skin Aging. NCBI
5. Microneedling in Dermatology: A Comprehensive Review of Applications, Techniques, and Outcomes. PMC