Findings

What do systematic reviews say?

43 questions · 45 findings · 2 reviews · Heart

No studies found 2 · 4.4%GRADE not reported 0 · 0%Very low 8 · 17.8%Low 10 · 22.2%Moderate 16 · 35.6%High 9 · 20%

Arrhythmias · adults with or without existing CVD

High showed no clear difference in arrhythmias compared with low long‐chain omega‐3 fats (low certainty).

1 finding from 1 review

Omega‐3 fatty acids for the primary and secondary prevention of cardiovascular disease 2020 · Cochrane Headline outcomes only
RR 0.99 [0.92, 1.06]
30 studies · 77990 participants
Low

Harms: bleeding · adults with or without existing CVD

It is very uncertain whether high changes harms: bleeding compared with low long‐chain omega‐3 fats (very low certainty).

1 finding from 1 review

Omega‐3 fatty acids for the primary and secondary prevention of cardiovascular disease 2020 · Cochrane Headline outcomes only
RR 1.12 [0.91, 1.37]
11 studies · 80147 participants
Very low

Harms: pulmonary embolus or DVT · adults with or without existing CVD

It is very uncertain whether high changes harms: pulmonary embolus or DVT compared with low long‐chain omega‐3 fats (very low certainty).

1 finding from 1 review

Omega‐3 fatty acids for the primary and secondary prevention of cardiovascular disease 2020 · Cochrane Headline outcomes only
RR 1.15 [0.44, 2.98]
5 studies · 3546 participants
Very low