Omega-3 and Female Athletes: Science, Benefits and What We Still Do Not Know

What Are Omega-3 Fatty Acids and Why Do They Matter for Female Athletes?

Omega-3 fatty acids—EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid)—are essential polyunsaturated fats that the body cannot produce on its own. They are obtained primarily by eating oily fish such as salmon, mackerel or sardines, and also from plant sources such as chia seeds or walnuts, although these have lower bioavailability.

Their role in cardiovascular and brain health is well established, but current research suggests key potential benefits for active women: inflammation control, muscle recovery, hormonal health and even metabolic efficiency. This raises the need to reconsider their role as a strategic nutrient in female performance.

Why Are So Many Female Athletes Low in Omega-3?

The Omega-3 Index (O3I) measures the percentage of EPA+DHA in red blood cells. An O3I ≥8% is associated with low cardiovascular risk, while <4% indicates high risk.

Most female athletes are below 5%, which may reflect:

• insufficient intake of marine omega-3 sources,
• sensory barriers such as the taste or smell of fish,
• lack of awareness of the benefits,
• mistrust of supplements,
• greater consumption of plant sources with lower biological effectiveness, compared with men, who tend to consume more marine sources.

How Does Omega-3 Benefit Performance by Type of Exercise?

a) Strength and power

• In active young women, 3–4 g daily of omega-3 improves grip strength and accelerates neuromuscular recovery after demanding eccentric exercise.
• An acute dose (~0,6 g EPA+DHA) before exercise has been shown to improve vertical-jump performance and strength in female futsal players.

b) Endurance and aerobic capacity

• Although trials exclusively in women are lacking, mixed studies with men indicate that 3 g/day for 12 weeks may increase VO₂max and energy efficiency.
• Achieving these benefits may require an O3I ≥ 8%, which in women could require doses above 3 g/day for at least 8–12 weeks.

c) Team sports and recovery

• In female collegiate basketball players, 8 weeks of EPA improved antioxidant markers and reduced post-training inflammation.
• Taking high doses only after exercise (2–3 days) does not appear as effective as maintaining continuous intake beforehand.
• In female futsal players, 1 g of fish oil (500 mg EPA + 100 mg DHA) together with 30 g of whey protein, before or after eccentric training, improved strength and vertical-jump performance and significantly reduced DOMS.

How Is Omega-3 Related to the Menstrual Cycle and Hormonal Health?

• During the luteal phase, inflammation and oxidative stress naturally increase. Omega-3, especially an EPA-rich formulation, improves the antioxidant response and reduces these markers, supporting recovery.
• Omega-3 supplementation may relieve menstrual symptoms such as pain and discomfort and improve mood in premenstrual syndrome.
• In women with polycystic ovary syndrome (PCOS), improvements have been observed in insulin sensitivity and certain hormonal parameters.

What Benefits Can Omega-3 Provide for Active Women Over +50 or Master Athletes?

The highest-quality studies show that:

• 2 g of EPA+DHA daily for at least 18 weeks enhances strength gains and improves muscle quality in older women who perform strength training.
• This effect was not observed in men.
• It may also contribute to joint health, functional improvement, maintenance of muscle mass and prevention of sarcopenia.

What Are the Optimal Omega-3 Dose, Duration and Timing?

According to the available evidence:

• Long-term dose: 2–3 g/day of EPA+DHA for 8–12 weeks.
• Single dose: 1 g of fish oil approximately 2 hours before intense exercise or competition.
• Before or after training: 1 g of fish oil combined with 30 g of protein or antioxidants may enhance its effects.

How Important Are the EPA:DHA Ratio and Supplement Quality?

EPA stands out for its anti-inflammatory potential, particularly useful during intense training and chronic inflammatory situations, with possible effects on muscle recovery and immune modulation.
DHA plays a key role in brain health and cell-membrane structure, making it relevant to neuroprotective processes.

Studies reporting consistent benefits use ratios of 1,5–2:1 in favor of EPA, although there is no consensus on the ideal ratio for female athletes.

What Do We Still Not Know About Omega-3 and Female Performance?

Although omega-3 shows great potential, clear limitations remain:

• Most studies are based on men or mixed populations.
• Specific evidence in female athletes is lacking regarding:
  • effects on body composition,
  • VO₂max,
  • the immune system,
  • hormonal responses in complex contexts.

The article's final reflection emphasizes that real progress depends on placing female athletes at the center of scientific research.

Final Thoughts

Omega-3 is emerging as a nutrient with valuable applications for female athletes, but the evidence is not yet complete. Most studies continue to be based on male or mixed populations, and many relevant questions—such as its effect on body composition, VO₂max, the immune system or hormonal changes in complex contexts—still lack a solid evidence base specific to active women.

Omega-3 can be part of progress, but the real momentum will come when female athletes also take their rightful central place in research.

Author:

Anna Teixidó Aguiló
Dietitian-Nutritionist, registration No.: MAD00674
Master's Degree in Sports Training and Nutrition

IG: ateixido

LinkedIn

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