Supplements are a great way to keep your body strong and well-functioning even if your diet isn’t the best. But which pills actually live up to their promises? Which vitamins and minerals are the ones you truly shouldn’t live without? Here are just four supplements to consider the next time you’re in a grocery store.

1. Astaxanthin

An astaxanthin supplement will help everything from inflammation to eye strain. Known as the “king of the carotenoids,” it offers numerous health benefits to those who take it on a regular basis.

2. Calcium

Calcium is critical for good bone health. If you aren’t getting enough from milk and dairy products, it’s time to start taking a supplement to ensure your strength and longevity as you age.

3. Vitamin B12

Are you tired all the time? Do your gums bleed for no reason, or do you bruise more easily than anyone else you know? You might be suffering from a vitamin B12 deficiency. Start popping a supplement a day to strengthen both your body and mood.

4. Zinc

Zinc can be found naturally in certain foods, but if you’re struggling to reach your daily recommended intake, a supplement works just as well. Stock up on zinc to keep your immune system in good working order.

These are just a few supplements that everyone should know. Even if you don’t need them now, you may need them in the future, so commit their names to memory in case of future health problems.