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Docosahexaenoic Acid (DHA) Facts
DHA (docosahexaenoic acid) is a long-chain omega-3 fatty acid found primarily in marine sources such as fatty fish, fish oil, and algae, and the most abundant fat in the human brain and retina. It serves as a critical structural component of neural tissue and is highly concentrated in the gray matter of the brain and the photoreceptors of the eye. DHA supports the fluidity and signaling capacity of cell membranes in the nervous system, playing a foundational role in cognitive function, vision, and neurological health across all stages of life. Like EPA, the body cannot efficiently produce DHA, making dietary or supplemental intake important.
Key Benefits of Docosahexaenoic Acid (DHA):
- Supports cognitive function, and memory through its role as a primary structural fat in brain tissue.*
- Contributes to healthy vision.*
- Supports normal neurological function throughout life.*
- Helps maintain cell membrane fluidity in the nervous system, supporting nerve signaling.*
- Works synergistically with EPA to support overall brain and cardiovascular health.*
Why it Matters:
The brain is approximately 60% fat by dry weight, and DHA makes up a substantial portion of that, particularly in areas linked with memory and higher cognitive function ¹. Lower circulating DHA levels have been associated with cognitive decline and reduced visual acuity as people age ².
Despite its critical role, DHA intake among U.S. adults averages only ~60–80 mg/day, far below levels studied in clinical research ³. DHA is concentrated almost exclusively in marine sources, making it one of the hardest essential nutrients to obtain from a typical Western diet. Because DHA cannot be adequately synthesized from plant-based ALA, supplementation is the most practical way to support and maintain healthy levels, particularly for those with limited seafood intake.
Citations:
1. Chang CY, Ke DS, Chen JY. Essential fatty acids and human brain. Acta Neurol Taiwan. 2009;18(4):231-241.
2. Yurko-Mauro K, McCarthy D, Rom D, et al. Beneficial effects of docosahexaenoic acid on cognition in age-related cognitive decline. Alzheimers Dement. 2010;6(6):456-464. doi:10.1016/j.jalz.2010.01.013
3. Papanikolaou Y, Brooks J, Reider C, Fulgoni VL 3rd. U.S. adults are not meeting recommended levels for fish and omega-3 fatty acid intake: results of an analysis using observational data from NHANES 2003-2008. Nutr J. 2014;13:31. doi:10.1186/1475-2891-13-31
