The Impact of Omega-3 Fatty Acid Supplementation on the Composition of Erythrocyte Membranes in Athletes

\*\*Inclusion Criteria:\*\* * Male competitive soccer players aged 16-35 years. * Regular participation in organized soccer training and competition. * A minimum of 6 years of systematic soccer training experience. * Participation in regular team training during the study period. * Habitual mixed diet. * Ability and willingness to maintain usual dietary habits and training load throughout the 4-week intervention. * Written informed consent provided by the participant. * For participants under 18 years of age, written informed consent provided by a parent or legal guardian and assent provided by the participant. \*\*Exclusion Criteria:\*\* * Current use of omega-3 fatty acid supplements or fish-oil products. * Use of omega-3 supplements within the 3 months preceding enrollment. * Known allergy or hypersensitivity to fish, seafood, fish oil, or any ingredient of the study supplements. * Diagnosed cardiovascular, metabolic, endocrine, gastrointestinal, neurological, inflammatory, autoimmune, or hematological disease. * Acute infection, injury, or illness that could affect participation in training or study assessments. * Use of medications or dietary supplements that could influence lipid metabolism, inflammatory status, hormonal profile, blood coagulation, cognitive function, or physical performance. * Regular use of anticoagulant or antiplatelet medication. * Significant change in diet, training volume, or supplementation during the study period. * Failure to comply with the supplementation protocol or attendance requirements. * Participation in another clinical or nutritional intervention study during the study period.