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With everything you have to worry about and remember every day, it can be hard to remember to take your supplements. I can relate—I have a graveyard of forgotten jars and canisters of vitamins and powders in my pantry. I had the best intentions but, between putting on the coffee, microwaving my breakfast, and making it back to the sink before the electric toothbrush in my mouth beeped, I just didn’t remember to take my vitamins every day. But there are some vitamins and nutrients that, if you’re deficient in them, will make you pay the price and fast. Calcium is one of them. When you were a child, your parents might have forced you to chug a glass of milk every morning, so you were guaranteed to get your calcium fix that way. But, as you got older, you might have started opting for lower calorie or lactose-free foods and started missing out on this nutrient. Here are surprising signs you’re calcium-deficient.

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You can’t sleep

If you toss and turn at night, it could be due to a calcium deficiency. Calcium is required to produce melatonin, a hormone that helps you relax at night and get those important Zzz’s. If you are taking a melatonin supplement, you could get to the root of the issue by taking a calcium supplement.

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Frequent cavities

Having enough calcium is important to the foundation of your teeth. When your teeth aren’t strong, it’s easier for them to develop holes and cracks, and for bacteria to get inside. If you’ve paid a pretty penny in fillings recently, it may be time to add calcium.

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Cramps

Calcium is important to the healthy motion of muscles. Without enough calcium, your muscles can become tender, and can contract at odd times, resulting in what you feel as uncomfortable and frequent cramps. If painful cramps wake you up at night or prevent you from exercising, try adding calcium to your diet.

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Mood changes

This is related to a vitamin D deficiency, and just one way you might know you suffer from it. If you’ve been feeling irritable, depressed, anxious, or suffering uncharacteristic mood changes, ask yourself if you’ve been getting enough vitamin D. It’s important to get it from the actual sun (wear SPF, of course). Without it, you’ll likely suffer mood changes. And then you can also likely expect a calcium deficiency.