Pro D3, in either capsule or liquid form, is best taken with a meal as this helps the body get the most out of the treatment. For Pro D3 liquid, shake the bottle before use. You can add it to water or food. Pro D3 capsules should be swallowed whole with water.

Maintenance doses, which includes Pro D3 400, 800, 1,000, 2,500 IU capsules and 2,000 IU liquids, are taken daily, unless specifically stated by your doctor or pharmacist.

For treatment doses, always follow your prescribing clinician’s instructions. Typically, the 20,000 IU capsules are taken twice a week for seven weeks. The 30,000 IU capsules are taken once a week for ten weeks in total. Treatment doses are usually followed by an ongoing maintenance dose that is taken daily.

The most common side effects for Pro D3 should not be confused with the product having common side effects. In fact, the most common are listed as “uncommon”, affecting less than one in 100 patients.

These include hypercalciuria and hypercalcaemia, which are high levels of calcium in the urine and blood.

Hypercalcaemia, in particular, can be dangerous and will need medical attention if you notice any of its symptoms. These include: digestive problems, severe fatigue, palpitations, disorientation, excessive thirst and needing to urinate frequently.

While vitamin D supplements are not known to cause allergic reactions in the vast majority of people who take them, it’s important to know what to look for in case they do present. Severe allergic reactions will require immediate medical attention, so look out for the following symptoms: swelling of the face, lips, throat or lips, hives, severe itching and rashes.

If you have dietary restrictions you should tell your doctor or pharmacist before buying Pro D3 or any other supplement or treatment. Products vary greatly by what they contain, so you might find some capsules are not vegan or halal or kosher, while other products might contain gluten or dairy.

If in doubt, you can always read the patient information leaflet that comes with your medication and lists all of its ingredients.

Pro D3 capsules are kosher, halal, vegetarian and gluten and dairy free. Pro D3 vegan capsules are also available in the strength of 800 IU.

Our main source of vitamin D is from the sun, so whenever possible you should expose your skin to sunlight without risking damage. In terms of how long for, it depends on the time of year, the strength of the sun and the pigmentation of your skin. You should always ensure that your skin does not burn from exposure to the sun as this greatly increases the risk of skin cancer.

Both are beneficial to us, but vitamin D3 is processed more efficiently than vitamin D2 and is therefore the more commonly used form in supplements and treatments. Pro D3, as the name suggests, uses D3, which is also called colecalciferol. Colecalciferol is also easier to store than its vitamin D2 counterpart (ergocalciferol).

Vitamin D2 and D3 are also separated by the food groups they’re found in. Vitamin D2 is found in vegetable sources, such as mushrooms, while D3 is found in animal products, such as some dairy and fish. Vitamin D3 is also added to certain foods, such as cereals.