Omega-3 Fatty Acids

EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) are long-chain omega-3 fatty acids that modulate inflammatory pathways by competing with omega-6 arachidonic acid for cyclooxygenase and lipoxygenase enzymes. This shifts eicosanoid production toward less inflammatory mediators (resolvins, protectins, maresins).

For skin specifically, omega-3s may reduce UV-induced inflammation (sunburn threshold), support the lipid component of the skin barrier, modulate sebaceous gland activity (relevant to acne), and reduce systemic markers of inflammation that contribute to chronic skin conditions.

• Reduced UV-induced inflammation and erythema (moderate evidence)
• Support for skin barrier lipid composition
• Anti-inflammatory effects relevant to acne, rosacea, and psoriasis
• Improved skin hydration via barrier support (some evidence)
• Possible reduction in acne severity through inflammatory pathway modulation

Effective range for skin outcomes: 1–4g combined EPA+DHA daily. Most skin-specific studies use 1–2g EPA+DHA.

EPA vs DHA ratio: For inflammatory skin conditions, higher EPA formulations may be more effective, as EPA is the primary anti-inflammatory omega-3. A 2:1 or 3:1 EPA:DHA ratio is commonly recommended for inflammatory conditions.

Timing: Take with a fat-containing meal to improve absorption. Omega-3s are fat-soluble; taking them on an empty stomach significantly reduces bioavailability.

Duration: Anti-inflammatory effects build over 4–8 weeks as cell membrane fatty acid composition shifts. Skin-specific outcomes may take 8–12 weeks.

Preferred: Triglyceride-form fish oil or re-esterified triglyceride (rTG) form. These have approximately 70% greater bioavailability than ethyl ester forms.

Alternative: Algae-derived EPA+DHA for vegetarians/vegans. Algal oil provides the same omega-3s without fish-derived sourcing.

Avoid: Cod liver oil at high doses (risk of excessive vitamin A intake). Flaxseed oil provides only ALA, which converts to EPA and DHA at very low rates (typically under 5%) — it is not an effective substitute.

Quality markers: Third-party tested for heavy metals (mercury, lead), PCBs, and oxidation (peroxide and anisidine values). IFOS (International Fish Oil Standards) certification is the most rigorous.

Oral omega-3s and topical barrier repair: Omega-3s support barrier function systemically by improving the lipid composition of cell membranes. This complements topical ceramide-based moisturisers, which restore barrier lipids externally. Using both together addresses barrier repair from inside and outside simultaneously.

With topical anti-inflammatory actives: Oral omega-3s reduce systemic inflammation while topical azelaic acid or niacinamide target local inflammation. This dual approach may be particularly useful for inflammatory acne or rosacea.

With sunscreen: Omega-3s have been shown to modestly increase the minimal erythemal dose (MED) — the UV exposure needed to cause sunburn. This is supplementary photoprotection only and absolutely does not replace sunscreen. Think of it as raising your baseline tolerance while sunscreen provides the primary defence.

Omega-3 and retinoid tolerance: Anecdotal reports suggest improved retinoid tolerance in people with adequate omega-3 status, possibly due to better barrier function. This is plausible but not confirmed by controlled studies.

• Taking omega-3 on an empty stomach (dramatically reduces absorption)
• Using flaxseed oil and assuming equivalent benefits to EPA/DHA
• Choosing cheap ethyl ester forms without checking bioavailability
• Not checking for third-party testing — rancid or contaminated fish oil is common
• Expecting omega-3s to replace sunscreen for UV protection

Rhodes et al. (2003): 42 subjects supplemented with 4g EPA daily for 3 months showed significantly increased sunburn threshold and reduced UV-induced DNA damage markers in skin biopsies. (Journal of Investigative Dermatology)

Khayef et al. (2012): Omega-3 supplementation (EPA+DHA) for 12 weeks in acne patients showed reduced inflammatory lesion count compared to controls. Small study but directionally positive. (Lipids in Health and Disease)

Huang et al. (2018): Meta-analysis of 13 RCTs found omega-3 supplementation improved symptoms of psoriasis, atopic dermatitis, and acne, with moderate overall effect sizes. (Journal of the European Academy of Dermatology and Venereology)