Deoxycholic Acid (DCA) Injections: How O-Slim Shot Works
The short version: Borrowing a trick from digestion, a deoxycholic acid (DCA) injection uses a lab-made copy of a natural bile acid to break apart fat cells in a small, targeted area, which your body then clears over the following weeks. O-Slim Shot is a DCA-based injection offered in short sessions of around 10 to 20 minutes, without anaesthesia. It suits modest, localised fat rather than large volumes.
DCA is one of the few fat-reducing injectables with formal regulatory approval, which is why many people researching injections start here. This guide focuses on how DCA itself works, what a treatment session looks like, and how to fit it into a visit to Seoul.
What is deoxycholic acid and how does it reduce fat?
Your body naturally produces bile acids, including deoxycholic acid, to help break down and absorb fat from food. When a synthetic form is injected directly into the fat layer under the skin, it acts as a detergent on fat-cell membranes. The membranes break, the cells release their contents, and the body's normal inflammatory and clearance processes remove the debris gradually.
Because it acts on cell membranes generally, DCA is placed carefully into fat and kept away from skin, nerves and muscle. That is one reason the injector's knowledge of anatomy matters so much.
Regulatory status
- In the United States, the Food and Drug Administration (FDA) has cleared DCA for one specific use: reducing submental fat, the fullness beneath the chin.
- In Korea, the Ministry of Food and Drug Safety (MFDS) authorises DCA more broadly for reducing localised fat.
- Approval tells you the ingredient has been assessed for a defined use; it does not mean every individual will see the same result.
How O-Slim Shot fits into DCA treatment
O-Slim Shot is the DCA-based injection offered at 365mc. A few features are worth knowing as you compare options:
- Short sessions: typically 10 to 20 minutes depending on the area.
- No anaesthesia: treatment is done without general or sedation anaesthesia, so most people return to their day afterwards. Like other 365mc treatments, it is planned after a doctor's assessment.
- Product transparency: the product is opened in front of the patient, so you can see what is being used.
- Combination planning: it can be used alongside LAMS or liposuction, with a gap of around four to six weeks when the same area is treated.
You can find area details on the O-Slim Shot page.
What happens during a DCA session?
- Assessment: a doctor examines the area, confirms the fullness is fat (rather than loose skin, muscle or a gland), and asks about your health and any medicines you take.
- Marking: the treatment zone is mapped, often with a grid, so the solution is spread evenly.
- Injection: a series of small, shallow injections places DCA into the fat layer.
- Aftercare advice: you are told what swelling to expect, how to care for the area, and when to come back.
Most people feel stinging, warmth or a burning sensation during and soon after the injections. Some clinics use cooling to make this more comfortable.
Results timeline and number of sessions
DCA does not give an instant change. Swelling in the first days can even make the area look fuller. Over the following weeks, as treated fat is cleared, the contour gradually becomes flatter or softer.
- Many people need more than one session for a visible difference.
- Sessions are spaced to let swelling settle and the body clear treated fat.
- The final result of each session is judged after the swelling has resolved, not in the first few days.
- Once DCA has broken a fat cell down, it is not expected to return; nearby untreated cells, however, can still expand if you put on weight.
The amount of fat treated is small, so do not expect the scales to move. If lowering overall body weight is your main aim, a medical weight-management plan is the right starting point.
Side effects and who should be cautious
Common, usually temporary effects
- Swelling, sometimes marked under the chin for several days.
- Redness, bruising and tenderness.
- Numbness or tingling over the area.
- Firmness or small lumps that usually soften with time.
Less common but important
- Nerve irritation near the jawline, which can temporarily affect the symmetry of the smile.
- Difficulty swallowing when treating under the chin, usually temporary.
- Skin ulceration or hair loss in the area if the product is placed too superficially.
- Uneven contour if the fat is treated unevenly.
Who may not be suitable
- People who are pregnant or breastfeeding.
- Those with an active infection or skin problem at the treatment site.
- People whose fullness is mainly loose skin, a prominent gland or visceral fat.
- Anyone with medical conditions or medications the doctor judges to raise the risk. Always share your full history.
DCA compared with other ways to reduce fat
- DCA vs hypotonic injections (HPL): DCA disrupts fat-cell membranes directly; HPL relies on osmotic pressure and sessions are typically closer together, around every 7 to 10 days.
- DCA vs fat freezing: cryolipolysis uses controlled cooling through an applicator and suits pinchable bulges that fit the device; DCA can be more precise in small or awkward spots.
- DCA vs LAMS: LAMS extracts fat directly while the area is numbed, usually giving a larger change in one session but with more recovery. See the LAMS vs fat-dissolving injections comparison.
- DCA vs double chin liposuction: for larger fullness under the chin, double chin liposuction may achieve more in a single treatment.
What affects the cost of DCA treatment?
You will normally be quoted individually; Korean medical advertising rules make published prices for uninsured treatments uncommon. Factors that shape your quote include:
- The area and its size.
- The amount of product needed per session.
- The number of sessions planned.
- Whether DCA is combined with LAMS, liposuction or other treatments.
If you are visiting from abroad, keep your passport and receipts, as eligible cosmetic fees may be partly refundable as VAT when you depart Korea within three months.
Planning DCA injections on a trip to Seoul
- Plan for swelling: avoid scheduling a session right before events, meetings or photos, especially for the chin or jawline.
- Think about repeat sessions: if a visible result is likely to need several sessions, ask whether a multi-trip plan or a single-visit alternative is more practical.
- Flying: because there is no anaesthesia, most people can fly soon after, but ask the doctor for advice specific to your treatment.
- Remote follow-up: send progress photos by message after you get home, so your coordinator and doctor can judge whether another session is worthwhile.
For a broader view of how injections fit with other options, see the treatment comparison guide.
What people usually ask
Which areas can DCA be used on?
The US approval covers the area under the chin, while the Korean authorisation is for localised fat more generally. Suitable areas are small, defined pockets; your doctor will advise which areas are appropriate for you.
How soon will I see a difference?
Change is gradual. Once the initial swelling settles, a softer contour usually develops over the following weeks, and several sessions may be needed.
Can I combine O-Slim Shot with LAMS?
Yes, many plans combine them. When the same area is treated with both, a gap of around four to six weeks is generally recommended.
Will DCA tighten loose skin?
No. DCA targets fat only. If laxity is the main concern, skin tightening or other approaches may be discussed.
Can I go back to work after a session?
Most people return to normal activities the same day, though visible swelling may make you prefer a quieter few days for facial areas.
If you have a small pocket under the chin, along the jaw or elsewhere that you think DCA might help, you can send a photo and ask whether O-Slim Shot suits it. An online or video consultation can also cover how many sessions to plan around your trip.
This explanation of DCA is general and not a substitute for medical advice. Whether the injection is appropriate for your area, and how many sessions it might take, is confirmed by a doctor who examines you.
