Fish oil has not been proven to fade existing acne scars. No clinical trial has directly tested whether omega-3 supplements improve the appearance of acne scarring. However, the biological properties of fish oil, particularly its anti-inflammatory effects and influence on wound healing, suggest it could play a modest supporting role in how your skin heals after acne and how visible those marks become over time.
The honest answer is nuanced: fish oil is more likely to help prevent severe scarring from active acne than to reverse scars you already have. Here’s what the evidence actually shows.
What Fish Oil Does to Healing Skin
The omega-3 fatty acids in fish oil, EPA and DHA, influence wound healing in two distinct phases. In a study of healthy adults given 1.6 g of EPA and 1.2 g of DHA daily, researchers found that after five days, the supplement group had significantly greater skin re-surfacing (epithelialization) of small wounds compared to a control group. That faster early healing is relevant because the quicker your skin closes over after an acne lesion, the less opportunity there is for deep or irregular scarring.
The second phase is more interesting for scar appearance. Omega-3s appear to inhibit collagen deposition in the later stages of wound repair. While that sounds counterintuitive, excess collagen is what creates raised, thickened scars. By dialing back that overproduction, fish oil may reduce the likelihood of excessive scar tissue forming. This effect has been observed in lab settings but hasn’t been confirmed in human scar studies, so it remains a plausible mechanism rather than a proven benefit.
Reducing Inflammation That Causes Scars
Most acne scars form because of prolonged, deep inflammation. The more inflamed a breakout, the more tissue damage occurs, and the worse the eventual scar. Fish oil attacks this problem at its source by shifting the body’s chemical signaling toward an anti-inflammatory state. Specifically, omega-3s block the production of leukotriene B4, a compound that fuels the kind of intense inflammation responsible for cystic and nodular acne lesions.
In a small clinical study, 13 people with inflammatory acne took 3 grams of fish oil (containing 930 mg of EPA) daily for 12 weeks. By week 6, measurable skin redness had decreased, and by week 12, 62% of participants had improved by at least one acne severity grade. Fewer and less severe active breakouts translates directly into fewer new scars forming. If your primary concern is preventing additional scarring from ongoing acne, this is where fish oil has the strongest case.
Fish Oil and Dark or Red Acne Marks
Many people searching about “acne scars” are actually dealing with post-inflammatory marks: the flat red or brown spots left behind after a pimple heals. These aren’t true scars (there’s no change in skin texture), but they can linger for months and are cosmetically frustrating.
DHA, one of the two main fatty acids in fish oil, has been shown in cell studies to reduce melanin production by speeding up the breakdown of tyrosinase, the enzyme your skin uses to make pigment. Related fatty acids like alpha-linolenic acid (ALA, a plant-based omega-3) demonstrated measurable skin-lightening effects in animal studies: after three weeks of topical application, skin lightness values increased significantly, and melanin content dropped by as much as 84% compared to untreated skin.
These are promising signals, but there’s a critical caveat. Most of this research used topical application of fatty acids directly on skin, not oral fish oil capsules. Whether swallowing fish oil delivers enough of these compounds to your skin cells to produce a visible lightening effect on dark marks is unknown. The biological pathway exists, but the delivery method matters enormously.
Atrophic vs. Raised Scars
Acne scars come in two broad categories. Atrophic scars are the indented, pitted kind (ice pick, boxcar, rolling) caused by tissue loss during healing. Hypertrophic or keloid scars are raised, caused by overproduction of collagen. Fish oil’s mechanism of curbing late-stage collagen deposition is theoretically more relevant to preventing raised scars than to filling in atrophic ones. For indented scars that already exist, fish oil doesn’t offer a clear biological pathway to rebuilding lost tissue.
A 2024 scoping review examining food supplements and scar management found that omega-3 fatty acids showed “promising” connections to scar improvement across four human studies, but the authors concluded the evidence was insufficient to recommend any supplement specifically for scar management. The research simply isn’t there yet.
Realistic Timeline and Dosage
If you decide to try fish oil for skin health, the clinical research on acne used about 930 mg of EPA daily (within roughly 3 grams of total fish oil) for 12 weeks. Visible reductions in skin redness appeared around the 6-week mark, with broader improvements by week 12. The American Heart Association recommends 1,000 mg of combined EPA and DHA daily as a general guideline, which aligns with the doses used in skin studies.
Don’t expect dramatic changes to existing scars within that window. The realistic benefit is a gradual reduction in redness and inflammation from active acne, potentially fewer new breakouts, and possibly less aggressive scarring from lesions that are still healing. For scars that are already mature (six months or older), fish oil alone is unlikely to produce noticeable improvement.
Side Effects to Know About
Fish oil is generally well tolerated. The most common complaints are digestive: fishy aftertaste, heartburn, nausea, or diarrhea. Taking capsules with food and choosing enteric-coated versions helps with these. At higher doses, fish oil can increase bleeding risk, which is worth noting if you take blood thinners or are planning any skin procedures like microneedling or laser treatments for your scars. A skin rash is a less common side effect, and people with seafood allergies should be cautious since the safety of fish oil in that group isn’t well established.
Where Fish Oil Fits in Scar Treatment
Fish oil is not a scar treatment. It’s a supplement with anti-inflammatory properties that may modestly support your skin’s healing environment. For existing indented acne scars, procedures like microneedling, chemical peels, laser resurfacing, and dermal fillers have far stronger evidence. For post-inflammatory red or dark marks, topical ingredients like vitamin C, niacinamide, retinoids, and sunscreen are more directly effective.
Where fish oil fits is as a background player: reducing systemic inflammation, potentially calming active breakouts, and creating slightly better conditions for your skin to heal cleanly from new lesions. If you’re dealing with ongoing inflammatory acne and want to reduce the chance of future scarring, adding fish oil to your routine is a reasonable, low-risk choice. If you’re looking to fade scars you’ve had for years, your results will come from other treatments.