How long should you take vitamin D supplements?

Vitamin D is crucial in maintaining our overall health, especially in bone strength and immune function.

Despite its importance, many of us find ourselves reaching for supplements, either due to dietary gaps or limited sun exposure.

Understanding when and for how long to take these supplements is vital to reap their benefits without any unintended consequences. This blog serves as a guide to help you navigate the world of Vitamin D supplementation.

We will explore why some of us need these supplements and offer clear, practical advice on the recommended duration for their use.

Whether you are someone who has just started considering supplements or you’ve been taking them for a while, this blog aims to provide you with the information you need to make informed decisions.

Is it safe to take vitamin D for a long time?

Figuring out the right amount and how long to take vitamin D supplements can feel like a puzzle. But don’t worry, it’s not as complicated as it seems.

Let’s break down the recommended dosage and duration to make sure you’re getting just what you need, nothing more and nothing less.

When it comes to vitamin D supplementation, there are some general guidelines that everyone should know [1]. These aren’t strict rules, but they’re a good starting point.

Adults typically need 600-800 IU daily. This range is usually enough to maintain healthy vitamin D levels for most adults.

If you’re over 70, your body might need a bit more, about 800 IU per day, because your skin doesn’t make vitamin D as efficiently.

If you’re taking a multivitamin, check how much vitamin D it contains. Sometimes, you might already be getting what you need from it.

Your body makes vitamin D when exposed to sunlight. So, if you spend a lot of time outdoors in the sun, you might need less from supplements.

Diet counts too. Foods like fatty fish, fortified milk, and egg yolks are good sources of vitamin D. Include these in your diet to reduce the need for supplements.

Remember, these guidelines are just a starting point. Your personal needs might vary based on your health, lifestyle, and where you live. It’s always best to talk with a healthcare provider to figure out the right amount for you. 

Featured product offer
Double Wood Supplements Vitamin D3 + K2 Liquid Drops
  • Contains trans-K2 to prevent hypercalcemia from high-dose D3 supplementation.
  • Gluten-free, soy-free, non-GMO, vegan.
  • Made in the US at a cGMP certified facility.

Duration of supplementation

Figuring out how long to take vitamin D supplements is a bit like deciding how long to water your plants – it depends on their current state and what they need to thrive. Here’s how to think about the duration of your supplementation:

  • If you’re correcting a deficiency, you might need a higher dose for a short period. For maintenance, a lower dose over a longer period works better.
  • They’ll show you how your levels are doing and when you can cut back or stop.
  • Some people might see their levels normalize quickly, while others take longer.
  • If your lifestyle changes (more sun, better diet), you may need less supplementation.
  • Your doctor can give you the best guidance on how long to take supplements, especially if you have health conditions.

The goal isn’t to stay on supplements forever; it’s to reach and maintain the level that’s right for you.

Keep an eye on your health, lifestyle, and vitamin D levels, and adjust your course as needed. It’s all about finding that sweet spot where your body feels just right.

Special considerations for children and teens

When it comes to children and teens, vitamin D supplementation needs a careful approach. Here’s what to keep in mind:

  • Kids and teens usually need lower doses than adults. Overdoing it can harm their growing bodies [2].
  • Adequate vitamin D is essential for healthy bone growth and overall development during these crucial years.
  • Always check with a pediatrician before starting any supplement regimen for a child or teen.
  • Encourage regular outdoor play for natural sunlight exposure and ensure a balanced diet rich in vitamin D.

Remember, the goal is to support healthy growth and development, not to overload their systems with unnecessary supplements. A pediatrician’s guidance is invaluable here.

Elderly and vitamin D

For the elderly, vitamin D plays a key role in maintaining good health, but their needs are a bit different:

  • Aging skin doesn’t produce vitamin D as efficiently, so a bit more might be necessary.
  • It’s crucial for preventing osteoporosis and fractures, common concerns in older age.
  • The body’s ability to absorb vitamin D can decrease with age, requiring adjustments in supplementation.
  • They can tailor the dosage to individual health profiles, considering any medications and existing conditions.

It’s all about ensuring the golden years are healthy and happy, with bones as strong as their spirits.

elderly and vitamin d

Pregnant and breastfeeding women

Pregnant and breastfeeding women have unique needs when it comes to vitamin D:

  • Adequate vitamin D is essential for the healthy development of the baby.
  • It helps the mother maintain her bone health and overall well-being.
  • The required dosage might be different during pregnancy and breastfeeding.
  • It’s important to discuss supplementation with a healthcare provider to ensure the right balance for both mother and baby.

This careful approach helps ensure a healthy start for the baby while keeping the mother strong and resilient.

Can vitamin D supplements have long term effects?

While vitamin D supplements are a boon for many, especially those who struggle to maintain optimal levels through diet and sunlight alone, it’s crucial to understand that like anything else, too much of a good thing can be harmful.

Long-term or excessive use of vitamin D supplements can lead to several health issues, some of which can be quite serious [3]. It’s not just about popping pills and hoping for the best; it’s about striking the right balance.


Hypercalcemia is a significant risk when you take too much vitamin D. This condition means there’s an excess of calcium in your bloodstream. It’s like a traffic jam of calcium, and your body struggles to handle it. The symptoms can be pretty unsettling:

  • You might feel nauseous or throw up.
  • Weakness and frequent urination are common signs.
  • In serious cases, it can lead to kidney stones or even affect your heart and brain.

It’s a classic case of too much of a good thing turning bad. Monitoring your vitamin D intake is vital to avoid this imbalance. Remember, maintaining a healthy balance is key to using supplements safely.

Kidney function and stones

Taking too much vitamin D can really put a strain on your kidneys. Here’s why:

  • Excess vitamin D ramps up calcium absorption in your body [4].
  • Your kidneys then work overtime to filter this surplus calcium.
  • This can lead to kidney stones, which are as painful as they sound.
  • Over time, this extra workload can even wear down your kidney function.

It’s like pushing your car to its limits constantly; eventually, it’s going to show signs of wear and tear.

So, it’s crucial to find that sweet spot with your vitamin D intake – enough to stay healthy, but not so much that your kidneys bear the brunt.

Featured product offer
Elm & Rye Vitamin D3
  • Available in capsules and gummies.
  • High levels of Vitamin D lead to leaner bodies, increased muscle mass, and better muscle function.
  • Contains Vitamin D and calcium that help maintain bone health.

Bone health

Here’s a twist: while vitamin D is essential for strong bones, overdoing it can actually weaken them. Sounds paradoxical, right? But here’s what happens:

  • Excessive vitamin D disrupts the balance of calcium in your body.
  • This can lead to a decrease in bone density, making them more fragile.
  • Ironically, this increases your risk of fractures – the very thing vitamin D is supposed to help prevent.

It’s a classic example of too much of a good thing becoming bad. So, while we need vitamin D for healthy bones, it’s crucial to avoid going overboard with supplements.

Gastrointestinal issues

When you go overboard with vitamin D supplements, your digestive system might wave a red flag. Here’s what could happen:

  • Your stomach might start feeling upset, a bit like a rollercoaster ride.
  • Constipation or its opposite, diarrhea, can make your days uncomfortable.
  • You might also experience stomach pain, which is never fun.
  • It’s like throwing a wrench in the well-oiled machine of your digestive system. 

These symptoms are your body’s way of saying, “Hey, slow down with the vitamin D!” So, listen to your gut – literally – and keep your supplement intake in check.

Neurological symptoms

Taking too much vitamin D can affect more than just your body; it can also impact your brain and nerves. Here’s what you might experience:

  • Feeling confused or finding it hard to focus? That could be a sign.
  • These high levels can make you feel disoriented, like you’re in a mental fog.
  • In some cases, it might even lead to depression or anxiety.

It’s as if your brain is sending an SOS, asking you to ease up on the vitamin D. So, while maintaining good vitamin D levels is important, remember, your brain health is just as crucial [5].

Neurological symptoms


Navigating the world of vitamin D supplementation can be tricky, but armed with the right information, you can make choices that benefit your health without going overboard.

Remember, the key is balance and personalization. Your needs are unique, and your approach to supplementation should be too.

Taking control of your health is empowering. It’s about making informed decisions that align with your body’s needs.

Whether you’re just starting on supplements, adjusting your current regimen, or simply looking to maintain good health, take these steps to heart. Your body will thank you for it.


How long should I stay for vitamin D?

The duration for taking vitamin D supplements varies based on individual needs, such as your current vitamin D levels, lifestyle, and overall health. It’s best to consult with a healthcare provider for personalized advice.

Is it safe to take vitamin D for a long time?

Taking vitamin D for an extended period is generally safe if you stick to the recommended dosage and regularly monitor your vitamin D levels with healthcare supervision. However, prolonged intake of high doses without medical advice can lead to adverse effects like hypercalcemia and kidney issues.

When should I stop taking vitamin D?

You should consider stopping vitamin D supplementation when your blood tests indicate that your levels are consistently within the optimal range. Always make this decision in consultation with a healthcare provider.

How often should you take vitamin D levels?

It’s generally recommended to check your vitamin D levels annually, especially if you are at risk for deficiency or are taking supplements. However, your healthcare provider may suggest more frequent testing based on your health needs and response to supplementation.

Featured product offer
Global Healing Vitamin D3
  • Vegan formula for strong bones, immune support, and brain optimization with active vitamin D.
  • Made from organic lichen and has cholecalciferol, the active form of vitamin D produced by sunlight.
  • Gives 5,000 IU per serving.


Photograph: RossHelen/Envato
The information included in this article is for informational purposes only. The purpose of this webpage is to promote broad consumer understanding and knowledge of various health topics. It is not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of your physician or other qualified health care provider with any questions you may have regarding a medical condition or treatment and before undertaking a new health care regimen, and never disregard professional medical advice or delay in seeking it because of something you have read on this website.