Trapezius Botulinum Toxin: Korea’s Trending “Shoulder Line Transformation”
One of the most sought-after body contouring treatments in Korean dermatology today is trapezius botulinum toxin injection — commonly known as the “shoulder slimming shot.” In Gangnam, its popularity rivals that of jawline slimming injections. Why are more people becoming concerned about this specific muscle?
The trapezius is a large, diamond-shaped muscle extending from the back of the neck across the shoulders. Poor posture from prolonged desk work, smartphone use, and carrying bags on one shoulder cause the upper trapezius to remain in a constant state of tension. Over time, a prominent “hard bulge” forms at the junction of the neck and shoulders — visually shortening the neck and making the shoulder line appear heavy and trapezoidal when wearing sleeveless or off-shoulder clothing. This muscle’s morphology directly shapes the first visual impression of the entire upper body.
The Science: Not “Slimming,” but “Giving the Muscle a Rest”
Botulinum toxin addresses trapezius hypertrophy through the same mechanism as jawline slimming. It temporarily blocks the release of acetylcholine at nerve endings — muscles stop receiving contraction signals and enter a “forced vacation” state. Over several weeks, the trapezius volume decreases and the shoulder-neck contour softens.
Unlike the precision-focused approach of facial injections, trapezius injection is designed for “selective volume reduction.” The doctor determines injection placement based on the actual degree of muscle hypertrophy, using 3 to 5 injection points per side, approximately 10 units per point. Total dosage per side typically ranges between 30 to 50 units, adjusted to the individual’s muscle bulk and aesthetic goals. The principle is “the minimum dose needed for optimal visible improvement.” Results begin appearing 2 to 4 weeks post-injection, with effects lasting 3 to 6 months before gradual metabolism — regular maintenance injections are recommended.
Brands & Pricing: How Much Difference Can 100 Units Make?
As a large-muscle treatment, trapezius injections are less dependent on low diffusion — making cost-effective brands a practical choice. Below are 2026 Korean market reference prices (per 100 units):
| Brand | Reference Price (per 100 units) |
|---|---|
| Korean Basic (Botulax etc.) | 59,000 – 86,900 KRW (~$44–65 USD) |
| Korean Premium (Coretox etc.) | 139,000 – 176,000 KRW (~$105–132 USD) |
| Imported (Xeomin/Germany) | 169,000 – 220,000 KRW (~$127–165 USD) |
| Imported (Dysport/UK) | 280,000 KRW (~$210 USD) |
Some clinics offer 200-300 unit packages. Maypure Hongdae’s summer body contouring package includes 200 units of trapezius botulinum toxin combined with other treatments at approximately 850,000 KRW. LOVAE offers Coretox body botulinum toxin packages starting at around 450,000 KRW.
Price differences of two to three times for the same product reflect not just location, but the doctor’s anatomical expertise and precision — a critical distinction that directly affects both safety and outcome quality.
Injection Process & Recovery Timeline
During injection: The procedure takes about 5 to 10 minutes. The doctor positions you with shoulders naturally relaxed or slightly shrugged to precisely target the muscle. An ultrafine needle delivers the solution directly to the mid-muscle layer through slow, controlled injection. Most patients report discomfort as “less painful than expected.”
Recovery timeline:
- Days 1-3: Mild soreness, pinpoint bruising, or slight swelling at injection sites. Do not lie flat for 4 hours post-injection to prevent toxin migration.
- Weeks 1-2: Bruising resolves; initial effects become noticeable.
- Weeks 3-4: Trapezius volume visibly decreases — shoulder-neck line becomes smoother, neck appears visually elongated.
- Weeks 6-8: Maximum aesthetic effect achieved.
- Months 3-6: Effects gradually diminish; muscle function naturally returns. Maintenance every 3-5 months is recommended.
Trapezius botulinum toxin has earned its reputation in Korea as one of the most cost-effective posture-improving procedures — with 100-unit promotional prices as low as 59,000 KRW. However, the trapezius region lies adjacent to the accessory nerve trunk, and improper injection technique can affect shoulder function.
When choosing a practitioner, don’t just compare prices. Pay attention to how they evaluate your muscle condition, how clearly they explain their injection strategy, and whether they provide proper follow-up care — these factors matter far more than any price quote.