Is vitamin k better for your bones than calcium? if so, which foods contain it?

Common sense: Despite "pop" claims, the last big study of vitamin k to prevent osteoporosis / osteomalacia was (as i'd expected) a miserable failure. Calcium supplements, though government-recommended, are less helpful nowadays than just being sure you have enough vitamin d. You'd do well to eat sensibly, stay physically fit, and recognize that internet stuff on "nutritional supplements" is mostly subscience.