reduced riboflavin + NAD(+) => riboflavin + NADH + 2 H(+)
reduced riboflavin + nad(+) => riboflavin + nadh + 2 h(+)
reduced riboflavin + NAD(+) => riboflavin + NADH + 2 H(+)
reduced riboflavin + nad(+) => riboflavin + nadh + 2 h(+)