No. 1: You’re tired.
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Not so fun fact: Vitamin D is one of the most common nutritional deficiencies worldwide. For example, in the United States alone, about 40% of folks are deficient. And your risk increases depending on certain factors, like having darker skin, using some medications, or living with certain health conditions. 👀 |
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If you’re deficient, why should you care? And can you even tell without getting a blood test? Scroll down to find out. |
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Before we get into that, check out these health stories: |
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Be well,
Morgan Mandriota
Newsletter Editor, Healthline |
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Written by Morgan Mandriota
October 17, 2026 • 2 min read |
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| Common symptoms of a vitamin D deficiency |
| Our bodies naturally make vitamin D from cholesterol when our skin is exposed to sunlight. Having enough of this “sunshine vitamin” can help protect us by reducing the risk of heart disease, regulating calcium absorption, and making sure our immune system is functioning A-OK … all really important stuff. |
| Here are some sneaky symptoms you might experience if your D levels are low: |
- frequent illness or infection
- fatigue
- back and muscle pain
- anxiety and depression
- slow wound healing
- bone and hair loss
- weight gain
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| Any of these sound familiar? Consider seeing a doctor to chat about your health and take a blood test. |
| If you’re deficient, don’t worry! There are plenty of ways to boost your vitamin D levels. If your deficiency is severe, a doctor may recommend a strong prescription or specific daily dosage. Or you could try sitting in the sunlight more often, eating vitamin D-rich foods, and even taking your supplement at the optimal time! |
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| Lighten up! |
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| Fitfirst Light Therapy Lamp |
| Light therapy lamps may help boost your vitamin D levels by simulating sunshine, but they’re usually expensive. Not this one! For $30, you can sit in front of up to 15,000 lux of simulated sunlight with 3 color temperatures and 4 brightness settings — rain or shine. Be sure to read safety precautions before you use a lamp like this. |
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| Every product we recommend has gone through either Healthline's or Optum Store’s vetting processes. If you buy through links on this page, we may receive a small commission or other tangible benefit. Healthline has sole editorial control over this newsletter. Potential uses for the products listed here are not health claims made by the manufacturers. Healthline and Optum Store are owned by RVO Health. |
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Thanks for reading! We’ll see you again on Friday.
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| Until next time, |
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Take care of yourself, and we’ll see
you again soon! |
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| This edition was powered by |
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sunshine.
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Every product we recommend has gone through either Healthline’s or Optum Now’s vetting processes. If you buy through links on this page, we may receive a small commission or other tangible benefit. Healthline has sole editorial control over this newsletter. Potential uses for the products listed here are not health claims made by the manufacturers. Healthline and Optum Now are owned by RVO Health.
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