Evidence Level
Flaxseed oil research centers on its role as the richest plant source of ALA omega-3 and its cardiovascular, anti-inflammatory, and dermatological benefits. Pan et al. (2009) published a comprehensive meta-analysis in The American Journal of Clinical Nutrition analyzing 28 studies, concluding that flaxseed supplementation significantly reduces total cholesterol and LDL, with effects driven primarily by ALA and lignan content. Khalesi et al. (2014) meta-analyzed 11 RCTs and found that flaxseed consumption reduces systolic blood pressure by 2.85 mmHg, with effects more pronounced in longer studies. Neukam et al. (2011) demonstrated in a 12-week RCT that daily flaxseed oil supplementation improved skin hydration, reduced transepidermal water loss, and decreased roughness in women with sensitive skin. Zhao et al. (2004) showed ALA-rich diets reduced CRP and IL-6 in dyslipidemic patients. The key limitation of flaxseed oil is its low conversion rate to EPA (5-10%) and DHA (<1%), as established by Burdge & Calder (2005), making it insufficient as a sole omega-3 source for conditions requiring high EPA/DHA (such as severe hypertriglyceridemia). Nevertheless, for plant-based diets and as a complementary omega-3, the evidence supports meaningful cardiovascular and dermatological benefits.