Evidence supporting the use of: Linolenic acid
For the body system: Eyes

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Linolenic acid, particularly alpha-linolenic acid (ALA), is an omega-3 fatty acid found in plant oils such as flaxseed and canola. Its use in supporting the eyes is primarily based on its role as a precursor to longer-chain omega-3 fatty acids like EPA and DHA, which are more directly involved in ocular health. Scientific studies have shown that omega-3 fatty acids, especially EPA and DHA from marine sources, are beneficial for eye health by supporting the structure and function of retinal cells and reducing the risk of conditions such as dry eye syndrome and age-related macular degeneration (AMD). While ALA itself is less efficiently converted to EPA and DHA in the human body, some evidence suggests that higher dietary intake of ALA is associated with a modest reduction in the risk of certain eye conditions, particularly dry eye symptoms. However, direct clinical trial evidence for ALA (linolenic acid) alone is less robust compared to EPA and DHA. Most recommendations for omega-3 supplementation for eye health focus on EPA and DHA, but ALA is recognized as a plant-based alternative, especially for those who do not consume fish. In summary, there is moderate scientific support for linolenic acid's role in eye health, mainly as a precursor to more active omega-3s, but its direct effects are less well-established.

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