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Pro D3

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Package Type
30 Capsules
30 Capsules
30 Capsules
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Your privacy is important, Prescription Doctor are committed to keeping your details completely confidential.

This is why we also take steps to conceal your prescription products under two layers of packaging.

Delivery and Packing
Discreet Delivery?

We have a commitment to delivering a discreet service and understand your need for privacy. We ship all orders via a trackable courier using discreet, plain packaging.

Do I Need to Wait in All Day for Delivery?

Once your order is dispatched you will receive a tracking number via sms and email.

Do You Deliver on Weekends?

We deliver medications between Monday and Saturday. You can upgrade to Saturday delivery on Friday.

My Order Hasn’t Arrived What Should I Do?

You should receive a tracking number with your order which you can use this number to track your parcel online. This should give you a clear indication of where your parcel is. If you haven’t received your parcel in the time frame given by our couriers, contact your local depot to find out where it is. You can also contact our support team who will do this for you.

Can I Be Notified by Text?

On checkout you will be asked to leave your mobile number so our courier can text you about the delivery. This is also useful if the courier has problems finding your address. We will not use your mobile number for anything else.

Payment Methods
How Can I Pay for My Order?

You can pay for your order using credit, debit card or via bank transfer.

I Don’t Have a Credit Card, How Can I Pay?

If you don’t have a credit or debit card you can pay via bank transfer. We will give you a unique reference number at checkout along with details of how to make the transfer. Once the money has cleared in our account, we will process your order.

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We are a completely secure site and take many measures to ensure your details are kept safe. We understand that you have a right to extreme privacy when purchasing sensitive health medications. All information that you provide to us is stored on our secure servers. Any payment transactions will be encrypted using SSL technology.

Payment and refunds?

You can pay for your order using credit, debit card and bank transfer.

Card Payment: Please notify us that you wish to cancel your order. Your refund will show available In 1 - 3 days.

Bank Transfer: A member of our team will contact you requesting for your bank details. These details are only used to transfer the funds back into your account.

Treatment Information

Table of contents

Patient Reviews: How Pro D3 Has Made a Difference

What is Pro D3?

Pro D3 is a Vitamin D supplement used to top-up your levels of Vitamin D. It comes available in either capsules or liquid form and both contain the active ingredient cholecalciferol, which is also known as Vitamin D3.

Vitamin D has multiple roles in the body. It helps to:

  • Regulate the amount of calcium and phosphate in the body
  • Promote healthy bones and teeth
  • Support immune, brain, and nervous system health
  • Regulate insulin levels and support diabetes management
  • Support lung function and cardiovascular health
  • Influence the expression of genes involved in cancer development

1 in 5 people in the UK have low vitamin D levels, according to a national survey. For most people, 400 IU (about 10 mcg) of vitamin D is the recommended daily intake.

A lack of vitamin D can lead to serious health problems such as, bone deformities (rickets) in children and bone pain caused by a condition called osteomalacia in adults.

Looking to buy Pro D3 vitamin D supplements online? With Prescription Doctor, you can buy with confidence from our UK based pharmacy. Place your order before 3pm and our pharmacy will dispatch your item the same day via a fast and discreet next-day delivery.

How Does Pro D3 Work?

Pro D3 works by helping your body absorb a mineral called calcium. Vitamin D3 is used as a dietary supplement in people who do not get enough vitamin D that their body needs to function normally.

Vitamin D is extremely important as it helps to maintain your bones and muscles. It also plays a role in supporting the immune system.

There are three ways your body can get the Vitamin D it needs:

  1. Exposure to enough direct sunlight on your skin
  2. Various food sources (such as oily fish, read meat, egg yolk and fortified cereals and dairy products)
  3. From a good vitamin D supplement

Most vitamin D is acquired from the sun or fortified foods

Normally most of the vitamin D we need is produced by cells in the skin, which produce vitamin D when exposed to sunlight. During the colder months, between October and March, the amount of sunlight decreases, so our bodies do not produce as much vitamin D.

Currently with more people staying indoors due to Coronavirus (Covid-19) they may be more deprived of vitamin D. As a result of the ongoing pandemic, the NHS have advised people should consider taking 10 micrograms of vitamin D a day if they are spending more time indoors than usual.

According to the British Nutrition Foundation, no single food or supplement will protect you from contracting covid-19. But eating a healthy, balanced and varied diet can support your immune system and help protect you from infections. You can watch their video below which breaks down some myths about nutrition and the immune system.

How do our bodies produce vitamin D?

Vitamin D is the only vitamin our bodies can produce itself. In fact, most of our daily requirement of vitamin D can be created by simply exposing our skin to the sun.

Ultra-violet type B (UVB) rays from the sun cause a reaction in cells in the body. These cells convert a type of fat called 7-dehydrocholesterol into vitamin D3 when exposed to UVB radiation. The fat-soluble vitamin D is then transported into the blood vessels deep inside the epidermis.

The blood then carries the vitamin throughout the body to areas which need it, such as the bones and muscles.

Vitamin D can also be consumed in your daily diet by certain foods such as oily fish and fortified dairy products.

Tiny finger-like protrusions in the intestine called villi pull out vitamins and nutrients from these foods and pass them straight into the blood stream.

When your body is not getting enough vitamin D from exposure to sunlight or diet, supplements can help to provide you with an adequate amount and keep you healthy.

You can safely buy Pro D3 online however you should always consult your doctor before purchasing any medication online.

How Do I Take Pro D3?

Pro D3 is a vitamin D supplement which is available as capsules and liquid.

If you are taking Pro D3 capsules: Take one capsule daily with or without food. Swallow the capsule whole with a glass of water. Do not crush, chew or break the capsule.

If you are taking the Pro D3 liquid: Take 0.5 to 1ml of Pro D3 solution. When taking liquid medicine, it’s important to use a medicine spoon. Using a kitchen spoon can result in taking the wrong amount of liquid. Once the bottle is open, use the liquid within three months.

Side effects and cautions of Pro D3

It's important to read the label or any supporting literature provided before taking Pro D3. The label or leaflet provides information about how to take the medicine, as well as any safety information you need to be aware of.

Who should not take Pro D3 vitamin D?

Do not take Pro D3 if you:

  • are allergic to any of the ingredients listed on the label or in the accompanying leaflet
  • have high levels of vitamin D in your blood (hypervitaminosis D)
  • have high levels of calcium in your blood (hypercalcaemia)
  • have high amounts of vitamin D in your urine (hypercalciuria)
  • have kidney stones or serious problems with your kidneys

Side effects

All medicines, including health and herbal supplements, carry the risk of side effects, though not everybody gets them. It's important to remain vigilant of side effects while taking Pro D3.

Common side effects of colecalciferol:

  • Abdominal pain
  • Headache
  • Hypercalcaemia
  • Hypercalciuria
  • Nausea
  • Skin reactions

Uncommon side effects of colecalciferol:

  • Constipation
  • Decreased appetite
  • Thirst
  • Vomiting

This is not an exhaustive list of side effects. Further information regarding the safety of Pro D3 can be found on the label or any accompanying pamphlet.

If you experience any side effects listed above or otherwise, contact your doctor or ask a pharmacist for assistance.


Do not take Pro D3 if you are allergic to colecalciferol or any of the other ingredients listed on the label or in the accompanying leaflet.

If you experience an allergic reaction after taking Pro D3, seek immediate medical attention by going straight to your nearest accident and emergency department. Remember to take any remaining medicine with you so that doctors know exactly what and how much you have taken.

Signs of an allergic reaction include:

  • Chest tightening
  • Dry, red and cracked skin
  • Itchy, red watery eyes
  • Raised, itchy, red rash (hives)
  • Swelling of the lips, tongue, eyes or face
  • Tummy pain, nausea, vomiting or diarrhoea
  • Wheezing

Pregnancy and breastfeeding

If you are pregnant, plan on becoming pregnant or breastfeeding, speak to your doctor before taking Pro D3 vitamin D supplements.

According to the NHS, it's recommended for women who are pregnant or breastfeeding to take vitamin D supplements to aid the development of their child. Regardless, you should always discuss this with your doctor to ensure which supplements are safe for you.

Other safety information

Always speak to your doctor before you buy Pro D3 vitamin D supplements online from Prescription Doctor.

Please inform our doctor of all the other medicines you are taking, including those bought over the counter, prescribed by your doctor, as well as health and herbal supplements.

Do not take Pro D3 past the expiry date printed on the packaging. The date refers to the last day of the specified month. For example, "EXP: 03/2025" means the 31st of March 2025.

Never throw away medicine via household or water waste as this can harm the environment. Take any unwanted or expired medicine to your pharmacy and ask them to dispose of it safely on your behalf.

Always store medicines and health supplements out of sight and reach from children and pets.

Never share your medicines or health supplements with anybody else, even if they have the same symptoms or have been diagnosed with the same condition as you.

Frequently Asked Questions

What should I do if I forget to take Pro D3 when I should?

If you forget to take Pro D3 when you should, take it as soon as you remember. If it is almost time for your next dose, skip the missed dose and take the next dose at the usual time. Do not take more Pro D3 to make up for a missed dose.

What should I do if I take too much Pro D3?

If you take too much vitamin D, speak to your doctor. Taking more vitamin D than you should over an extensive period can cause a build up of calcium in the body (also known as hypercalcaemia) which can be harmful.

Can I drink alcohol while taking Pro D3?

It is unlikely that alcohol affects Pro D3 however you should not drink more than the recommended 14 units of alcohol per week.

Will Pro D3 impact my ability to drive or operate machinery?

Pro D3 should not impact your ability to drive or operate machinery.

When should I take vitamin D supplements?

You can take vitamin D supplements at any time of the day which suits you. It's best to take them at the same time everyday. If you often forget when to take medicines and supplements, try using a pill box to remind you or work them into your daily routine, such as by taking them with breakfast.

Does sunscreen have an impact on the amount of vitamin D I can get from the sun?

Sunscreen is unlikely to affect how much vitamin D you get from the sun, according to the British Association of Dermatologists (BAD).

Can vitamin D prevent or treat Covid-19?

There is a no evidence to suggest that Covid-19 can be prevented or treated with vitamin D supplements.


NHS, 2020. Vitamins and minerals: Vitamin D

Treatment information

  • Product Name: Pro D3
  • Manufacturer: Synergy Biologics
  • Active Ingredient(s): Colecalciferol
  • Administration: Oral
  • Presentation: Capsules and liquid
  • Available Strength: 400IU, 800IU, 1000IU, 2500IU, 3200IU
  • Exemption: Pharmacy
  • Dosage: Take 1 capsule daily
  • Description: Pro D3 is a vitamin D supplement which is available as a capsule or liquid.
  • Drug Class: Vitamin
  • Alcohol Consumption: No influence
  • When Pregnant: Speak to your doctor before taking Pro D3 if you are pregnant.
  • When Breastfeeding: Speak to your doctor before taking Pro D3 if you are breastfeeding.
  • Price: 9.99 GBP

Authored & Reviewed By

Mohamed Imran Lakhi

Mohamed Imran Lakhi

MPharm - Lead Pharmacist
Imran Lakhi is the superintendent pharmacist and founder at Prescription Doctor. He has been at the core of our team.

Published on: 16/10/2020 Reviewed on: 13/03/2024

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