
A high-quality single-ingredient supplement containing essential omega-3 fatty acids, typically sourced from fish oil, to support mental health, physical health, and performance.
I would say it's going to be a high-quality omega-3 fatty acid, typically taken in the form of fish oil.
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"The speaker identifies a high-quality omega-3 fatty acid (fish oil) as the single-ingredient supplement that serves the greatest role in increasing mental and physical health."