Vitamin D is often nicknamed the sunshine vitamin, but its work goes far beyond a sunny day. It helps your body absorb calcium, keeps bones strong, and supports your muscles and immune system. As the years pass, our skin naturally becomes less efficient at making vitamin D from sunlight. This means many people in their 60s and beyond may be at higher risk for low vitamin D, especially if they spend more time indoors or cover up when outside.
If you have been wondering whether your levels are too low, it helps to know what to look for—while also remembering that these signs can have many possible causes. Below are seven warning signs that deserve attention, plus a clear explanation of what your skin can and cannot tell you about vitamin D.
1. Persistent Muscle Weakness
Muscles rely on vitamin D to function smoothly. When levels dip too low, some people notice a sense of heaviness or weakness, especially in the thighs and hips. Getting up from a low chair may take more effort. Climbing a few steps or rising from bed can feel harder than it used to.
It is important to be cautious before blaming weakness entirely on vitamin D. Muscle changes can come from many sources, including reduced activity, nerve compression, medication side effects, or recovery from an illness. If you have noticed a steady decline in strength over several weeks, keep track of when it started and how it affects your day-to-day life. Sharing those details with your healthcare provider can help them decide whether checking your vitamin D is appropriate or whether another cause needs attention.
Gentle strength exercises, such as sit-to-stand repetitions or light resistance training, can help maintain muscle function while you and your clinician sort out the cause. Do not start high-dose supplements on your own without guidance, especially if you take other medications.
2. Bone Pain or Tenderness
Vitamin D helps your body absorb calcium and supports normal bone mineralization. When vitamin D is very low for a long time, bones can become poorly mineralized, a condition called osteomalacia in adults. People sometimes describe a deep, aching discomfort in the hips, pelvis, lower back, or legs. Pressing on the shins or ribs may feel unusually tender.
Bone pain should never be ignored. While low vitamin D can contribute, so can arthritis, stress fractures, pinched nerves, and other medical issues. Seek an evaluation if pain lasts more than a few weeks, disturbs your sleep, or limits your activity. Your clinician may check your vitamin D, calcium, and other labs, and consider imaging or a bone density scan if needed.
Good bone health also depends on regular movement, enough dietary calcium and protein, maintaining a healthy weight, and keeping other conditions (like thyroid disease) controlled. Vitamin D is one piece of a bigger picture.
3. Feeling Tired More Often
Low energy can sneak up gradually. Some people with low vitamin D report feeling tired throughout the day or less refreshed after sleep. Research has found connections between low vitamin D and fatigue in some groups, but tiredness is a nonspecific symptom. Sleep apnea, anemia, thyroid changes, depression, certain medications, and dehydration can also contribute.
If fatigue is new or getting worse, it deserves a conversation with your healthcare provider. They may ask about your sleep, review medications, and check labs. Vitamin D may be part of that workup, but it is rarely the only factor. Addressing sleep quality, managing stress, and staying hydrated are simple steps you can take right away while you and your clinician decide on testing and the right plan.
4. Frequent Falls or Difficulty Walking
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Very low vitamin D can weaken the large muscles around the hips, making walking feel less steady. You might notice a shorter stride, more effort getting out of a chair, or hesitation stepping off a curb. This can increase the risk of falls in older adults.
Even so, falls are usually caused by many things at once. Inner ear problems, vision changes, numbness in the feet, low blood pressure, joint pain, and medications such as sedatives can all play a role. If you have fallen or nearly fallen, bring it up with your clinician. A fall prevention checkup may include a medication review, vision and balance screening, and a few simple home safety changes like better lighting and removing loose rugs. Physical therapy and gentle strength training can help rebuild stability, whether or not vitamin D is part of the picture.
If a supplement is recommended, stick with the dose your clinician suggests. Taking more will not necessarily improve balance and can sometimes do harm.
5. Muscle Aches and Cramps
Some people with low vitamin D report achy muscles or nighttime cramps, often in the calves or feet. These sensations are uncomfortable, but they are not unique to vitamin D deficiency. Cramps can be related to dehydration, overuse, nerve irritation, or side effects from medications like diuretics or statins. Low levels of other nutrients can also play a role.
If cramps or aches persist, it is wiser to look for the cause than to begin large doses of vitamin D on your own. Simple steps such as staying well hydrated, gently stretching before bed, and using heat on tight muscles may bring relief. If symptoms continue, your clinician can decide whether to test your vitamin D or consider other explanations.
6. Fragile Bones and Fractures
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Vitamin D and calcium work together to support strong bones. When vitamin D is low for a long time—especially alongside low calcium intake—bones may become thinner and more likely to break. Adults who have osteoporosis, repeated fractures, or conditions that reduce nutrient absorption, such as celiac disease or a history of certain gastrointestinal surgeries, may be more likely to benefit from having their levels checked.
Bone health is influenced by many factors. Weight-bearing movements like walking, light strength exercises, enough protein, and not smoking all matter. Hormonal shifts, certain medications such as long-term steroids, and family history also play a part. Vitamin D is helpful, but it is not a cure-all. If your clinician recommends a bone density scan or a specific treatment plan, it is because they are looking at your whole risk picture.
7. Mood Changes
Researchers have found links between low vitamin D and symptoms such as low mood or loss of interest. Vitamin D receptors are present in many parts of the body, including the brain, which may help explain the connection. However, studies do not consistently show that taking vitamin D improves mood when people do not have a confirmed deficiency.
If you feel persistently sad, less motivated, or notice changes in sleep or appetite for more than a couple of weeks, talk with a healthcare professional. Depression and anxiety are treatable, and waiting rarely makes them easier to handle. Sunlight, physical activity, and time with others can support mood, but they are not a substitute for care when it is needed.
Does Vitamin D Deficiency Cause Severely Dry, Peeling Skin?
Pictures of very dry, scaly, peeling skin on the lower legs sometimes make the rounds online, with claims that they show vitamin D deficiency. That appearance is not a recognized, specific sign of low vitamin D. Severe scaling can occur with conditions like eczema, psoriasis, or ichthyosis, and can also be worsened by dry air, frequent hot showers, and some medications.
Vitamin D plays a role in skin biology, but you cannot diagnose a deficiency by looking at the skin on your legs. If your skin develops thick scales, persistent redness, cracks that bleed, or peeling that does not improve, consider seeing a dermatologist. Moisturizing daily, using fragrance-free products, and running a humidifier in winter can help, but a proper diagnosis is key to lasting relief.
How Can You Find Out If Your Vitamin D Is Low?
The most direct way to assess vitamin D status is a blood test called 25-hydroxyvitamin D, often written as 25(OH)D. Not everyone needs routine screening. Testing is generally more useful when you have symptoms, when you have risk factors for deficiency, or when your clinician is monitoring a known problem like osteoporosis.
People who may benefit from testing include those with osteoporosis or frequent fractures, chronic kidney or liver disease, disorders that limit absorption of nutrients, a history of certain weight-loss or intestinal surgeries, or those taking medications that affect vitamin D metabolism, such as some anti-seizure drugs, glucocorticoids, or rifampin. If you tend to avoid sunshine entirely or cover your skin for cultural or medical reasons, testing might also be reasonable.
Keep in mind that labs may use different reference ranges. Your clinician will interpret results in the context of your overall health. It is possible to have too little vitamin D, but it is also possible to have too much, which can raise blood calcium to dangerous levels and strain the kidneys. That is why it is best to check first and supplement smartly.
What About Sunlight?
Sunlight helps your skin make vitamin D, but the ability declines with age. A short time outdoors most days may help, yet sun safety still comes first. If you are at high risk for skin cancer, do not rely on unprotected sun exposure to maintain vitamin D. Sunscreen, hats, and shade remain essential. If you prefer to limit sun exposure, talk with your clinician about dietary sources and whether a supplement is appropriate for you.
Foods That Provide Vitamin D
You can get vitamin D from food, although very few foods naturally contain large amounts. Fatty fish such as salmon, trout, sardines, and mackerel are reliable sources. Egg yolks provide a modest amount. Many everyday staples are fortified, including some milks, yogurts, plant-based beverages like soy or almond milk, and certain breakfast cereals. Some mushrooms are exposed to ultraviolet light to boost their vitamin D content, and labels will usually say so.
A simple way to build more vitamin D into meals is to rotate choices you enjoy. You might have baked salmon with vegetables one evening, a fortified yogurt parfait with fruit for breakfast, or a vegetable omelet that includes a couple of egg yolks. If you prefer plant-based options, look for fortified beverages and cereals, and try sautéed UV-exposed mushrooms as a side dish.
Supplements may be helpful when diet and sunlight are not enough. For adults aged 71 and older, the recommended dietary allowance in the United States is generally 800 IU, or 20 micrograms, daily from all sources. Your own needs may differ based on your medical history, medications, and lab results. Avoid taking high doses without medical guidance. Too much vitamin D can push calcium too high, which can cause nausea, confusion, abnormal heart rhythms, and kidney problems.
If your clinician recommends a supplement, ask about the form and dose. Vitamin D3 (cholecalciferol) tends to raise levels more efficiently than D2 (ergocalciferol) for many people, though both can be effective. Taking vitamin D with a meal that contains some fat may improve absorption. If you take medications such as thiazide diuretics, digoxin, or long-term steroids, or if you have kidney disease, make sure your care team knows before you start or change a supplement.
Putting It All Together
Vitamin D deficiency can affect bone and muscle health, and in more severe cases may contribute to weakness, bone pain, and mobility problems. Some people also notice tiredness or mood changes. None of these signs, by themselves, confirm a deficiency. Skin that is very dry and peeling, while uncomfortable and important to treat, is not a specific sign of low vitamin D and often points to a separate skin condition.
The most reliable approach is to look at the whole picture: your symptoms, risk factors, medical history, and, when appropriate, a blood test. Work with your clinician to decide whether testing or supplementation makes sense for you. Taking a thoughtful, measured approach helps you avoid both the problems of deficiency and the risks of taking too much.
Day to day, you can support healthy levels by eating vitamin D–rich foods, staying active to strengthen muscles and bones, and practicing sun safety while enjoying time outdoors. If concerns arise—such as new muscle weakness, bone pain, frequent falls, or persistent changes in mood—reach out for a medical evaluation rather than guessing. Recognizing possible warning signs matters, but finding and treating the true cause matters even more.
