With the overwhelming flood of supplements promoted by influencers and podcast hosts, it can feel like maintaining health into old age requires an ever-growing medicine cabinet.

However, a new study suggests that just one supplement could make a real difference in longevity: Omega-3. Regular intake of this fatty acid may actually slow the ageing process by up to four months.

Biological age is a more accurate predictor of lifespan than chronological age. Unlike the number of birthdays you’ve celebrated, it reflects the rate of change in your DNA—something that varies from person to person.