Fish oil supplements on heart and brain

An analysis of the studies on the risks and benefits of fish oil supplements:

Alzheimer’s: https://youtu.be/NScltXkIO44?si=BkDqBgO5q4j2a4VC

Heart health: https://youtu.be/T6HSAhG7p1M?si=V4QbVLVE86SsXbn3

The latter suggests 840 mg daily has no contraindications.