@drgreghealth: Here are three telltale signs of low vitamin D in your body. I've been a functional medicine doctor for more than 25 years, and this is one of the most common deficiencies I test for regardless of the season. Sign one: persistent fatigue that does not resolve with more sleep. Vitamin D plays a direct role in cellular energy production, and chronically low levels show up first as tiredness that will not lift. Sign two: aching bones or muscles, especially lower back pain that does not have an obvious cause. Vitamin D is essential for how your body regulates calcium, and low levels directly affect bone and muscle comfort. Sign number three: getting sick more often than the people around you. Vitamin D is a genuine immune modulator, and low levels are consistently linked to more frequent colds and infections. Low vitamin D does not always announce itself clearly. It just makes everything else a bit harder than it needs to be. And for what it is worth, I like to see optimal levels between 60 and 100. When was yours last tested? Find the root. Heal the whole.

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