
Vitamin B12

Essential for normal blood and brain function, Vitamin B12 should most definitely be on your radar once you've turned 40 (and more so after turning 50). Children and young adults, are likely to get the B12 they need from food (you can find it in meat and animal products including chicken, fish, dairy and eggs), however, it tends to be more poorly absorbed as the body ages, especially around 50, when stomach acid levels deplete. So, taking a supplement is generally advised. The current recommended dietary allowance is 2.4mg per day, but should you get more, there's no need to worry about taking too much. Since it is a water-soluble vitamin, you pee out what you don't need.