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Vitamin D

Vitamin D plays an important role in the absorption of calcium and phosphorus in the gut. We produce it when our skin is exposed to sunlight.

  1. Vital for good bone and muscle health
  2. Daily supplements available 
  3. These help to prevent or treat deficiency

Getting the supplement you need online is simple with our secure consultation facility. Approved orders are shipped by tracked next-day courier.

  • UK prescribers
  • 24 hour delivery
  • Secured payment

0 product result(s) for Vitamin D

Fultium D3

Fultium D3

  1. Easy to take capsules
  2. Prevents and treats vitamin D deficiency
  3. Twice a day treatment
InVita D3

InVita D3

  1. Available in different strengths
  2. Prevents vitamin D deficiency
  3. Capsule medication

Vitamin D is often referred to as the ‘sunshine’ vitamin and is essential for our body to maintain healthy bones and teeth. It is made when skin is exposed to sunlight, specifically ultraviolet B (UVB) rays. It can also be found in certain food sources, such as oily fish and fortified cereals, but generally only in small amounts. We get the majority of our vitamin D from exposure to sunlight.

How much vitamin D do we need per day?

In the UK, the reference nutrient intake, or RNI, of 10mcg per day for vitamin D was set by the Scientific Advisory Committee on Nutrition. In 2016, Public Health England advised that everyone over the age of 4 should consider taking a 10mcg vitamin D supplement daily, in particular during winter months, in order to help prevent deficiency and associated health issues.

What causes low vitamin D?

Vitamin D deficiency can occur when someone isn't exposed to enough sunlight. Anyone can be susceptible to vitamin D deficiency but there are specific groups who are more at risk. Expectant and breastfeeding mothers provide their child with lots of nutrients, including vitamin D, so their own stores may become depleted. People over the age of 65 years and those who are housebound also have a greater risk because in many cases their skin is not exposed to enough sun.

As we age the layers of our skin get thinner which makes it harder for it to produce sufficient amounts of vitamin D. Darker skinned people may sometimes not naturally produce enough vitamin D either. Certain medical conditions, such as Crohn’s and ulcerative colitis, and medications can alter the way the body deals with vitamin D.

Our skin produces differing amounts of vitamin D depending on skin type and the strength of the UVB rays it comes into contact with. Their strength is altered by the time of day and year. The UK climate means that during the winter months the majority of the area is not penetrated by UVB rays at all. This means that from November to March most of the population relies on vitamin D stores that their body should have created over the summer.

Vitamin D deficiency is highly common in the UK but many people do not realise that they have it. Mild cases don’t tend to cause obvious symptoms and can just leave the person feeling generally unwell, achy and tired. However, reported symptoms include bone pain and muscle weakness affecting mobility.

What can happen if I have low vitamin D?

Without vitamin D the body is unable to efficiently absorb calcium and phosphorus in the small intestine. If left untreated, a lack of vitamin D can worsen and lead to more severe health complications such as osteomalacia, osteoporosis and bone deformities. Your doctor may suspect you have vitamin D deficiency simply by looking at your past medical history, lifestyle and any symptoms. However, they can also diagnose the condition with a blood test.How to treat low vitamin D

How to treat low vitamin D

Supplements like Fultium D3 and Invita prevent vitamin D deficiency by supplementing vitamin D levels. It is an easy to swallow capsule. The prescribed supplement course can vary in length and strength depending on whether it is being used as a preventative measure, or actively treating deficiency.

How to buy vitamin D online

You can order Fultium D3 for the prevention of vitamin D deficiency through our site by taking our secure online consultation. Orders are reviewed by registered doctors, before being dispensed by our UK pharmacy following approval. We ship using next-day courier, so that you can receive your treatment within one working day.

Page last reviewed:  26/04/2022
Types of Treatment

Vitamin D supplements are typically prescribed to those at risk of vitamin D deficiency. These help to prevent the condition from developing.

Vitamin D deficiency can lead to serious health complications such as osteoporosis and osteomalacia. At risk groups such as pregnant women and housebound people may be advised to take a supplement as a precautionary measure.

Someone who is vitamin D deficient will also typically be advised to take supplements, but in higher doses.

How do they work?

Fultium D3 contains the active ingredient colecalciferol which is also known as vitamin D3. Vitamin D is used by the gut to help with the absorption and processing of calcium and phosphate. These minerals are essential for good bone and tissue health.

What are the side effects?

Fultium D3 can cause unwanted side effects. One of which is known medically as hypercalcaemia and refers to excess calcium in the blood. This can cause symptoms such as sickness, a loss of appetite, stomach ache, constipation, muscle weakness, drowsiness and confusion.

Vitamin D supplements can also lead to too much calcium being found in the urine which is known as hypercalciuria. You can read further information on the side effects on the specific product page and also within the patient guide.

Can I take them with other medications?

There are some medicines that may interact with or alter the efficacy of vitamin D supplements. They include heart medicines, laxatives, epilepsy drugs, barbiturates, glucocorticoids, actinomycin and imidazole antifungals. Your doctor will make an assessment of any drugs you are currently taking or have recently taken.

Page last reviewed:  26/04/2022
Question and Answers

What’s the difference between the medications?

The Fultium D3 doses available at Treated.com are 400IU and 800IU. They are taken either once every two days, or every day, depending on your doctor's instructions. 

Should I take Fultium D3?

It depends how much vitamin D you already get, and how susceptible you might be to deficiency. Your suitability may also be influenced by current or previous medical conditions or treatments. Speak to your doctor to find out more.

Are there different side effects?

Fultium D3 can cause excess calcium in the blood or urine. For a full breakdown of side effects, refer to the patient information leaflet for this product.

Order vitamin D treatment online

Check with your doctor if you are not sure, or have never taken Fultium D3 before. They will be able to advise you on the most appropriate dose, if the supplement is required.

You can renew your prescription for Fultium D3 with our private consultation facility. Orders are checked by registered doctors, who will issue a prescription for your treatment if it is suitable. Our UK pharmacy dispenses approved orders, before sending them by special delivery.

Page last reviewed:  26/04/2022

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We promise to keep your details secure and private. We will never sell your information or share it with third parties. Whatever treatment you buy online from us, we will send in plain, unmarked packaging via our secure courier service.

Delivery on all items is included in the price. After your order has been dispatched, you’ll be supplied with a tracking number, allowing you to follow the progress of your items every step of the way. We deliver to anywhere in the UK, so whether you’re in London, Birmingham, Manchester, Glasgow or Cardiff, your order will be at your door within just 24 hours of approval from our doctor.

This content was reviewed by a clinician on

26 April 2022
dr daniel

Dr Daniel Atkinson

(GP Clinical Lead - GMC No. 4624794) 26 April 2022
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