Evidence check: Omega-3 Index in the context of fatigue

The Omega-3 Index measures the percentage of EPA and DHA in red blood cell membranes and is a validated biomarker for long-term omega-3 status. In the context of fatigue, the evidence is mixed: some studies suggest benefits for inflammation-related fatigue (e.g., in rheumatoid arthritis or post-chemotherapy), while others find no significant effect. The Omega-3 Index itself is not a direct fatigue marker—it only reflects fatty acid intake. Fatigue is multifactorial (sleep, stress, nutrient deficiencies, hormones, psychological factors). A low index may indicate suboptimal intake, but improving fatigue solely through omega-3 supplementation is not guaranteed. MyBody-X does not offer an Omega-3 Index test; the provided context contains no specific studies or products on this topic. Thus, the assessment is based on general knowledge, not company-specific evidence. Caution against overblown marketing: a blood test alone cannot replace medical workup for fatigue causes.