00:00Meat, fish, eggs, and dairy are the only natural food sources of vitamin B12.
00:04A new review asks how that vitamin connects to heart health.
00:08The narrative review was published in the Nutrition Journal.
00:11It found low B12 levels are linked to cardiovascular disease.
00:15Low B12 lets a compound called homocysteine build up in the blood.
00:19High homocysteine is linked to blood vessel damage and plaque formation.
00:23Low B12 is also linked to signs of electrical instability in the heart.
00:27But supplement trials tell a different story.
00:30A Cochrane review of more than 71,000 participants found no meaningful benefit for coronary outcomes.
00:37B vitamin combinations were linked to about a 10% drop in stroke.
00:41That rose to 30-35% in regions without folic acid fortification.
00:46Most trials tested vitamin combinations, not B12 alone.
00:50So the link with heart disease is real.
00:53Supplements just have not consistently prevented major heart events.
00:56Disclosure, this video contains stock footage and content created or enhanced using AI-assisted tools.
