Bio-Oil can modestly improve the appearance of scars, but the evidence is mixed. Its blend of plant oils, vitamin A, and vitamin E works primarily by hydrating scar tissue and promoting skin cell turnover, which can soften texture and fade discoloration over time. It won’t erase scars, and some of its key ingredients have conflicting research behind them.
What Bio-Oil Actually Does to Scars
Bio-Oil is a mineral oil-based skincare product containing vitamins A and E along with botanical oils like calendula, lavender, rosemary, and chamomile. Its main mechanism for improving scars is hydration. Well-moisturized scar tissue looks smoother and less raised because the skin is plumped, which reduces the contrast between the scar and surrounding skin.
Vitamin A is the most active ingredient for scar improvement. It promotes cell turnover, encouraging old, damaged skin cells to shed and new ones to form more quickly. This accelerates the natural remodeling process that scars go through and can reduce discoloration over weeks and months of consistent use. Vitamin A also helps with fine lines and uneven skin tone around the scar area.
The botanical oils contribute mostly through their moisturizing and skin-soothing properties. Lavender has mild antifungal qualities, and calendula and chamomile are traditionally used for calming irritated skin. These won’t dramatically change a scar on their own, but they support the overall hydrating effect of the formula.
The Vitamin E Problem
Vitamin E is one of the most commonly recommended ingredients for scars, and Bio-Oil contains it. But the research is genuinely split. Some studies show vitamin E reduces the appearance of scars, while others suggest it can actually worsen how scars look. A well-known dermatology study found that vitamin E applied topically caused contact dermatitis in a significant portion of participants and offered no cosmetic benefit over plain petroleum jelly.
This doesn’t mean Bio-Oil will make your scar worse. The vitamin E concentration in the formula is relatively low compared to applying pure vitamin E oil. But it does mean that the “vitamin E heals scars” claim that often gets attached to Bio-Oil is oversimplified.
New Scars vs. Old Scars
Bio-Oil tends to work better on newer scars that are still in the active healing and remodeling phase. During the first one to two years after an injury, your skin is still laying down and reorganizing collagen fibers. Keeping the area hydrated and encouraging cell turnover during this window gives you the best chance of a less visible scar.
Older, fully mature scars are harder to change with any topical product. Bio-Oil may soften them slightly and reduce dryness or itching, but the structural changes in mature scar tissue are deep enough that a surface oil has limited reach. For established scars, dermatological treatments like laser therapy or microneedling are more likely to produce noticeable results.
How to Use It
The recommended approach is to apply Bio-Oil twice daily, morning and night, massaging a small amount into the scar and the skin immediately around it. Consistent use over at least three months is typically needed before you can judge whether it’s making a difference. Some people notice softening and subtle fading within a few weeks, but meaningful change takes longer.
Only apply Bio-Oil to fully healed, closed skin. Using it on open wounds, fresh surgical incisions, or broken skin can trap bacteria and irritate the area. Wait until any scabs have fallen off and the wound has completely closed before starting.
Will It Cause Breakouts?
Bio-Oil is labeled non-comedogenic, meaning it’s formulated not to clog pores. Cosmetic-grade mineral oil, which forms the base of the product, is designated as safe by the FDA and doesn’t carry the same pore-clogging risk that crude or industrial mineral oils do.
That said, it’s still an oil-based product, and some people with acne-prone skin find that it worsens breakouts. If you’re using it on facial scars, particularly acne scars, start with a small test area for a week or two before applying it broadly. If you notice new whiteheads or increased oiliness, your skin may not tolerate it well.
What Bio-Oil Won’t Do
No topical oil can eliminate scars entirely. Scars form because the body repairs skin damage with collagen fibers that are structurally different from the original tissue. Bio-Oil can improve surface appearance, reduce redness, and soften texture, but deep, raised (hypertrophic or keloid) scars and pitted acne scars involve changes that go well beyond what a moisturizing oil can address. For these types of scars, professional treatments are far more effective.
Bio-Oil also isn’t uniquely superior to other scar products. Silicone-based scar sheets and gels have stronger clinical evidence behind them for flattening and fading raised scars. If you’re deciding between options, silicone products are generally better supported for surgical and traumatic scars, while Bio-Oil is a reasonable, affordable choice for mild scarring and general skin texture improvement.