Many women feel self-conscious about their shoulder line in off-shoulder tops — the neck looks short, the shoulders appear broad, and chronic trapezius tension leads to constant shoulder and neck stiffness. Trapezius hypertrophy is not just an aesthetic concern; it results from muscle use patterns — prolonged phone use (tech neck), poor sitting posture, and gym compensation can all progressively thicken the trapezius muscle. Coretox botulinum toxin shoulder slimming is the most established non-surgical solution in Korean aesthetic medicine, delivering noticeably more graceful neck and shoulder contours from a single session.
How Coretox Shoulder Slimming Works
Coretox (South Korea’s next-generation botulinum toxin type A) is injected into the upper trapezius muscle bundles, where it selectively blocks the neuromuscular junction signaling. The hyperactive muscle stops contracting, its volume gradually reduces, and the shoulder line naturally becomes smoother and more slender. Because the muscle is no longer in a state of constant tension, many patients also report improvement in chronic shoulder and neck stiffness.
Who Is a Good Candidate?
- Well-developed trapezius muscles making shoulders appear broad in off-shoulder or spaghetti-strap clothing
- Visually short neck with poorly defined collarbone line
- Chronic shoulder and neck stiffness from prolonged sitting or desk work
- Post-exercise trapezius compensatory hypertrophy (e.g., from shoulder presses)
- Non-surgical candidates seeking a more elegant swan-neck silhouette
The Rappoel Coretox Shoulder Slimming Procedure
- Consultation:The doctor assesses trapezius size, left-right asymmetry, and muscle tension to determine injection sites and dosage
- Site Mapping:With the patient seated upright, the doctor marks injection points on both upper trapezius bundles (4–6 points per side)
- Injection:Fine-needle precise injection — the entire procedure takes about 5–10 minutes with minimal discomfort
- Aftercare:Return to daily activities immediately — no downtime required
Results Timeline and Duration
- Onset of effect:Shoulder line softening visible at 2–4 weeks; peak results at 6–8 weeks
- Duration per session:Approximately 4–6 months
- Recommended frequency:Maintenance injections every 5–6 months; after 2–3 consecutive sessions, the muscle adapts and results last progressively longer
Frequently Asked Questions
- Q1: Will Coretox shoulder slimming affect daily activities or exercise?
- No. Coretox only relaxes the aesthetic hyper-contraction of the upper trapezius without affecting functional movements such as lifting or sports. Return to normal work and life immediately after the procedure.
- Q2: Is this the same product used for jawline slimming?
- Both are botulinum toxin, but injection sites, dosage, and point distribution differ. Rappoel uses the same Coretox brand, with different protocols tailored to each treatment area.
- Q3: How does Coretox slimming differ from losing weight through exercise?
- Exercise-induced fat loss is systemic and cannot selectively target the trapezius. Coretox provides precise, selective relaxation of the upper trapezius bundles. The two are complementary — maintain good posture through fitness; use Coretox for targeted neck-shoulder line refinement.
- Q4: How many units are needed per session?
- Dependent on individual trapezius size — typically 40–60 units per side (80–120 units bilateral). The exact dosage is determined during the doctor’s consultation.
- Q5: What are the side effects of Coretox shoulder slimming?
- Mild redness or small bruises at injection sites typically resolve within 1–3 days. A small minority experience temporary mild weakness when raising arms — this resolves naturally within 1–2 weeks.
- Q6: Can I exercise after Coretox shoulder treatment?
- Avoid intense upper-body exercise for 24 hours post-injection; normal exercise can resume thereafter. We recommend avoiding high-intensity trapezius-focused weight training for 2 weeks post-treatment.
Clinic Information
- 📍 Address: 5F, 77 Seocho-daero, Seocho-gu, Seoul
- 🚇 Access: Gangnam Station Exit 10, 3-minute walk (Seoul Metro Line 2)
- 🕐 Hours: Mon–Fri 10:00–19:00 | Sat 10:00–17:00
- 💬 Booking: WeChat rappoelkr | Line rappoelkr
Contact Rappoel Dermatology Clinic
📍 77, Seocho-daero, Seocho-gu, Seoul, South Korea
🕐 Mon–Fri 10:00–19:00 · Sat 10:00–17:00
💬 WeChat Main: rappoelkr | WeChat Backup: rappoelkr2 | LINE: rappoelkr
Scan to connect with us
WeChat (Main)
WeChat (Backup)
LINE