Low vitamin D levels aren’t always detectable, but symptoms can occur if you have a deficiency.

Here are the signs and how to treat them.

Its also involved in immune and muscle function and has anti-inflammatory and neuroprotective properties, says theMayo Clinic.

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So yeah, its kind of a big deal.

Possibly nothing, if youre just falling a little short.

But what do noticeable symptoms even look like?

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board-certified family medicine physician atProvidence Saint John’s Health CenterSanta Monica, California

Adequate to optimal levels of vitamin D are critical for healthy immune function, Gomer says.

Pale skin

Feel like youve lost some color?

The change in your complexion might happen from more than just the weak winter sun.

close up of person drinking a green smoothie that may cause their poop to be green

Pale skin can also be a symptom of vitamin D deficiency, Gomer says.

Or it could be that youre not getting enough vitamin D. (Or hey, maybe both!)

Vitamin D has a role in regulating serotonin and melatonin, which affect mood, Gomer says.

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FYI,serotoninregulates mood, whilemelatoninplays a role in sleep.

And when youre not getting good sleep, youre more likely to end upfatiguedthe next day.

Can a vitamin D deficiency cause permanent damage?

cup of matcha green tea sitting on a wooden ledge

board-certified family medicine physician atProvidence Saint John’s Health CenterSanta Monica, California

In theory, yes.

They can test your vitamin D levels and recommend supplements or medications to help improve symptoms.

Vitamin D tests arent usually part of a routine checkup, so youll likely have to ask for it.

LOS ANGELES - FEB 10: Patrick Schwarzenegger at the White Lotus Season 3 Premiere at Paramount Studios on February 10, 2025 in Los Angeles, CA

Its a good idea (for most people) to get this test when youre undergoing routine labs.

No one should just take a supplement without knowing their baseline levels, Gomer says.

If they do suggest a supplement, be sure to stick with their guidelines for dosing.

Woman drinking a protein meal replacement shake in the kitchen

Taking megadoses of vitamin D can be toxic, but not getting enough can exacerbate your symptoms.

Food

Its tough to get enough D from food alone, Gomer says.

However, a vitamin D deficiency can cause symptoms that affect your quality of life and your overall well-being.

They can order tests, help you understand your baseline, and recommend treatments to improve your symptoms.

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