The best skin booster injection technique places small, closely spaced microdeposits in the superficial dermis, using a fine 30–34 G needle at a shallow angle, and following the manufacturer's instructions for each product. Published reviews favour multipuncture intradermal placement over deep retrograde threading, but no study has proven one method superior.
Key Takeaways
- Target depth is the superficial (papillary) dermis; subdermal placement mainly adds volume rather than improving skin texture.
- Rho et al. (2024) recommend a 33–34 G needle, bevel up, at about a 10-degree angle with closely spaced multipuncture.
- Beads or papules, bruising and transient swelling are the typical technique-related events; product choice and placement affect them.
- Evidence comparing named techniques head to head is limited, so training and instructions for use should guide practice.
What Is the Correct Skin Booster Injection Technique?
There is no single universal method, but the literature converges on shallow, intradermal, multipuncture delivery. A 2024 review in Archives of Plastic Surgery by Rho, Kim, Kim and Lee favours a closely spaced multipuncture approach over the retrograde technique used for deep HA fillers.
The same review describes needle entry at about a 10-degree tangential angle, a 33- or 34-gauge fine needle with the bevel facing up, and a target in the superficial dermis. It also notes an inverse relationship between particle size and lateral spread: smaller particles travel deeper, which matters when choosing between product types. Our guide to skin boosters vs dermal fillers explains why these products are placed differently.
How Deep Should Skin Boosters Be Injected?
Reviews describe the superficial dermis, preferably the papillary dermis, as the target. Rho et al. report that intradermal injection improved skin texture, while subdermal injection mainly replaced volume.
In practical terms, this is why skin boosters are not treated as small-volume fillers. A product intended to hydrate or stimulate dermal repair gains little if it is deposited in the subcutaneous plane, and one deposited too superficially may produce visible beads.
Which Needle Size and Angle Are Used?
Rho et al. recommend a 33- or 34-gauge needle, bevel up, at roughly 10 degrees. A 2026 observational study of polynucleotide high-purification technology in the Journal of Cosmetic Dermatology states that a thin needle, usually 30–32 G, may be used.
The ranges differ slightly because products differ in viscosity and the packaged needle supplied by the manufacturer may differ. Always use the needle specified in the product's instructions for use. Review sources also mention alternatives such as multineedle injectors and needle-free jet injectors, which aim to reduce discomfort and variability, though conventional hypodermic needles remain simple and inexpensive.
| Parameter | Reported in literature | Source |
|---|---|---|
| Target layer | Superficial (papillary) dermis | Rho et al., 2024 |
| Method | Closely spaced multipuncture | Rho et al., 2024 |
| Needle | 33–34 G, bevel up (review); 30–32 G for PN (observational study) | Rho et al., 2024; Lanza et al., 2026 |
| Angle | About 10 degrees to skin | Rho et al., 2024 |
| PN regimen (Korean practice) | 2 mL per session, every 3–4 weeks, 3–4 sessions | Rho et al., 2024 |
How Does Technique Differ for PN and HA Skin Boosters?
Both are placed intradermally, but the risks differ. Polynucleotides such as PN form a porous three-dimensional scaffold and are described as safe with high immunological safety, while cross-linked HA can leave visible beads.
For PN, the review cites Korean practice of 2 mL per session, every 3–4 weeks, for 3–4 sessions, and a European consensus suggesting effects last 6–12 months after three sessions three weeks apart. Product-specific details are covered in how long Rejuran Healer lasts and the comparison of Rejuran Healer, HB and I. For HA, rheology matters; see cross-linked vs non-cross-linked HA skin boosters.
HA-specific considerations
Rho et al. note that intradermal cross-linked HA can form beads or papules, most often on the lateral cheek. Suggested prevention is lightly cross-linked HA, small boluses and avoiding overly superficial placement.
What Technique-Related Side Effects Should Practitioners Expect?
Mild erythema, swelling lasting hours and transient bruising are the common reactions reported. The 2026 Lanza et al. study of 66 patients and 106 questionnaires reported only transient, mild effects and no serious or unexpected events, attributing them mainly to injection technique.
That study was observational and short-term, and it did not compare techniques, so its results should not be generalised. Nodules are a separate topic, particularly with collagen stimulators; see our HA filler nodules guide for prevention and management. Any intradermal product carries vascular risk awareness requirements, and practitioners should know the facial danger zones and emergency protocols.
What Should Distributors and Clinics Verify Before Standardising a Protocol?
Verify the instructions for use, the supplied needle gauge, the local regulatory status of each product and the training provided. Technique guidance in a review is not a substitute for the manufacturer's labelled directions.
Clinics evaluating Korean polynucleotide boosters can review Rejuran Healer and Rejuran HB. Regulatory status differs by country and should be confirmed for your market before purchase.
Frequently Asked Questions
What depth should skin boosters be injected?
Published reviews describe the target as the superficial dermis, preferably the papillary dermis. Rho et al. (2024) report that intradermal placement improved skin texture, whereas subdermal injection mainly replaced volume. Product instructions for use and practitioner training determine the exact technique for each device.
What needle size is used for skin booster injections?
Rho et al. (2024) recommend a 33- or 34-gauge fine needle, bevel up, entering at roughly 10 degrees to the skin. A 2026 real-world polynucleotide study notes that a thin needle, usually 30–32 G, may be used. Always follow the manufacturer's instructions for the specific product.
Why do visible papules or beads form after intradermal HA?
Intradermal cross-linked HA can form beads or papules, most often on the lateral cheek, according to Rho et al. (2024). Suggested prevention includes lightly cross-linked HA, small boluses and avoiding overly superficial placement. Product choice and the patient's skin both influence the result.
How often are polynucleotide sessions repeated in Korean practice?
Rho et al. (2024) describe standard Korean practice for PN as 2 mL per session, every 3–4 weeks, for 3–4 sessions. A European consensus cited in the same review suggests effects last 6–12 months after three sessions spaced 3 weeks apart. Individual protocols vary by product and patient.
Is there evidence that one injection technique is superior?
Not conclusively. The 2026 Lanza et al. observational study in the Journal of Cosmetic Dermatology did not compare injection techniques, and Rho et al. call for larger, longer randomized trials. Technique should therefore follow manufacturer instructions, training and clinical judgement rather than a single claimed best method.
Conclusion
Consistent results depend on consistent depth, spacing and product-appropriate technique, not on a single named method. Clinics and distributors who want documentation and product details for Korean skin boosters can contact HolyPath through our inquiry page.
References
- Rho NK, Kim HS, Kim SY, Lee W. Injectable "Skin Boosters" in Aging Skin Rejuvenation: A Current Overview. Arch Plast Surg. 2024;51(6):528–541. pmc.ncbi.nlm.nih.gov/articles/PMC11560330
- Lanza E, et al. A Real-Life Assessment of Injectable Polynucleotides High Purification Technology in Aesthetic Medicine for Skin Rejuvenation. J Cosmet Dermatol. 2026;25(1):e70532. pmc.ncbi.nlm.nih.gov/articles/PMC12759169
This article is for informational purposes for licensed medical professionals and distributors. It is not medical advice. Treatments should be performed only by qualified practitioners in accordance with local regulations.