Is Arachidonic Acid Supplementation a Valuable Support in the Context of Resistance Training? A Narrative Review

Arachidonic acid (AA), an omega-6 polyunsaturated fatty acid, serves as a metabolic precursor for prostaglandins (PGs) such as PGE2 and PGF2α, which have been implicated in the regulation of skeletal muscle adaptations to resistance exercise. On this basis, AA supplementation has been proposed as a potential ergogenic aid in resistance training, under the hypothesis that increasing endogenous AA availability through supplementation may enhance PGs synthesis, thereby potentially influencing muscle remodeling and recovery process. However, AA remains a relatively underexplored candidate. This review aimed to summarize and critically evaluate the current evidence regarding the effects of AA supplementation in the context of resistance exercise. The limited available studies provide preliminary mechanistic observations suggesting that AA supplementation may be associated with changes in muscle strength and anaerobic performance and with modulation of the acute inflammatory response to exercise, without affecting chronic inflammation. Conversely, findings related to body composition and muscle hypertrophy remain inconsistent and a significant effect has not been consistently observed. Despite these preliminary insights, the current body of evidence is insufficient and heterogeneous, precluding the recommendation of routine clinical or practice-based use. Future well-designed, long-term investigations are warranted to clarify the efficacy, optimal dosage, and timing of AA supplementation, as well as its safety profile and potential applications across populations differing in age, sex, nutritional status, and training background.