Omega-3 for the brain: how much DHA is needed for memory

DHA and the brain: why it’s not optional

DHA (docosahexaenoic acid) is not “another brain supplement.” It is a structural component without which the brain physically cannot function normally. DHA makes up 40% of brain polyunsaturated fatty acidsand 60% of retinal fatty acids.

The brain cannot synthesize DHA on its own - only from food or supplements. With a deficiency, neuronal membranes become rigid, synapses work worse, and neuroplasticity decreases.

What happens with DHA deficiency

• Decreased memory - both short-term and long-term
• Slowing down information processing - the brain literally “slows down”
• Impaired neuroplasticity - it is more difficult to learn and adapt
• Increased risk of depression - DHA is involved in serotonin signaling
• Accelerated cognitive declinewith age
• Dry eyes and blurred vision

EPA vs DHA: which is more important for the brain?

DHA is a structural component. Forms neuron membranes, ensures their fluidity and proper functioning of receptors. DHA is needed to support the brain.

EPA - anti-inflammatory. Suppresses neuroinflammation and is a precursor of neuroprotective resolvins. In depression, EPA is more important than DHA (meta-analysis of 26 RCTs).

The brain needs BOTH, but with different emphasis:

• Memory and cognition → more DHA
• Depression and inflammation → more EPA

Dosages by purpose

• General brain health:500-1000 mg DHA + 500 mg EPA daily
• Improving memory and focus: 1000-2000 mg DHA + 500-1000 mg EPA
• For depression: EPA 1000-2000 mg + DHA 500-1000 mg (EPA:DHA ratio minimum 2:1)
• Pregnancy:Minimum 300 mg DHA - critical for fetal brain
• Take with fatty foods - absorption increases 3 times

How to choose

• Triglyceride form (TG) - digestibility is 70% higher than ethyl esters
• High DHA—at least 500 mg DHA per serving
• IFOS 5 stars – purity from mercury and heavy metals
• Brands: Nordic Naturals (Ultimate Omega), Carlson (Elite Gems)

Alternatives for vegetarians

Fish get DHA from algae. Vegan algae-derived DHA supplements are a complete alternative. Brands: Nordic Naturals Algae Omega, Ovega-3.

Resume from Novird

• DHA is not an optionbut a necessity for a functioning brain
• Minimum 1000 mg DHA/dayfor cognitive tasks
• Triglyceride form + IFOS
• With fatty foods, effect after 4-8 weeks

Golden Rule: If you don't eat fatty fish 3-4 times a week, you need a DHA supplement. This is not marketing, but neurobiology: the brain cannot build neuronal membranes without DHA.