We typically process and ship Pro D3 orders within 4-5 business days. Standard shipping times vary depending on your location and option of shipping chosen. You can find more details about our shipping policy on our Shipping & Delivery page.

We offer a 30-day return policy for items in new, unused condition. If you are not satisfied with your purchase, please contact our customer support team to initiate a return. Please note that certain conditions and exclusions may apply. You can find more information on our Returns & Refunds page.

Yes, we offer international shipping the Republic of Ireland. Please check our Shipping & Delivery section for additional details.

Once your order is shipped, depending on your choice of shipping, you may receive a tracking number via email. You can use this tracking number to track the status of your package. If you have any issues with tracking your order, please reach out to our customer support team.
If you have selected standard shipping then please allow 3-8 business days before contacting if you have not received your order.

The Pro D3 range, with the yellow sunshine background on the packaging, is made using Colecalciferol from sheep's wool.
Sheep are not harmed during this process.

The Pro D3 Vegan range, with the green sunshine background on the packaging, is made using Colecalciferol from lichen algae.

The following is applicable for Pro D3 Liquid Drops and Pro D3 Vegan Liquid Drops, both 20ml pack size.

Each drop contains 100 IU of Vitamin D3.
1 Drop = 100 IU
4 Drops = 400 IU
10 Drops / 0.5ml = 1000 IU
20 Drops / 1ml = 2000 IU

All Pro D3 products are manufactured at Synergy Biologics, purpose built, dedicated HACCP certified, GMP certified facility, in Walsall, West Midlands, England, UK. The entire manufacturing site, production lines, processes, information collection and management systems are certified as Halal, Kosher, Vegetarian and Vegan.
Synergy Biologics are HACCP certified, ISO 9001 certified, GMP certified.

All Pro D3 products are formulated to be free from all recognised food allergens (Food Standards Agency - Food Allergens and Intolerance) including Crustaceans, Dairy, Egg, Fish, Lactose, Milk, Nuts (Ground Nuts and Tree Nuts), Peanuts, PEG, Sesame, Soya, Wheat and Yeast. 
Our on-site Pharmacists are always available to answer any specific query on allergens.

For further suitability information, please visit the following page - Suitability of Pro D3.

Pro D3 products are never and will never be tested on animals.

Professional and Elite Athletes choose Pro D3 because they will only supplement with products from manufacturers that they trust, to avoid inadvertently taking prohibited substances.
Pro D3 Sport 20K is also independently tested for the absense of WADA Prohibited Substances by LGC.

A certificate of analysis is issued for every batch of Pro D3 products and is available immediately on request.
Simply email - technical@synergybiologics.co.uk -  with the Pro D3 product name, batch number and expiry and we will aid you with your request.

There are various benefits to adding a high strength Vitamin D supplement to your daily regime. In particular, Vitamin D supports bone strength, muscle function and general brain health.

Standard doses of Vitamin D have a strength of 400IU, where anything stronger than this is typically considered to be high strength. In specialist circumstances, you may wish to take a high strength dose, such as for athletic training or if you’re following a vegan diet.

Whilst liquid Vitamin D3 is not generally considered to be more effective than capsules, there are various benefits to choosing this option. Most notably, liquid vitamins absorb faster than tablets, so may be preferred by those looking for a fast-acting supplement.

Beyond this, liquid options can be a top choice if you have difficulty swallowing tablets, or if you have stomach absorption issues. At Pro D3, we supply a wide range of liquid vitamins with a range of strength levels - find out more today.

At Pro D3, we supply a range of vegan Vitamin D supplements, including our Vegan 800 IU Vitamin D3 capsules. Entirely free from animal products, our supplements are Vegan Approved, where we’re transparent about the ingredients included in every capsule.

For instance, within the 800IU D3 capsules, you’ll find the following -
Bulking Agent: Microcrystalline cellulose, Vitamin D3, Anti-Caking Agent: Magnesium stearate, Outer Capsule Shell: Hypromellose, Titanium dioxide.

We take care to only add essential ingredients to our capsules, so that you can feel the full effect of your vitamins.

Vitamin capsules are described using the iu measurement, which stands for International Units. This measures the biological activity of medical products, describing their potency per unit of mass or volume.

This means that our 1000iu Vitamin D3 capsules are particularly high strength, giving you a more powerful dose than the daily recommended intake. As such, this product should only be taken by those requiring an especially strong Vitamin D fix, where we recommend that you consult a medical professional before changing your regimen.

Vitamin D deficiency is increasingly common in the UK, where 1 in 5 adults and approximately 20% of children are thought to be lacking in this vital nutrient. These deficiencies tend to spike during the winter months, particularly in the UK when the daily dose of sunlight is not enough to provide enough natural Vitamin D.

 As such, the NHS recommends that everyone in the UK takes 10 micrograms or 400 international units of Vitamin D per day - so why not browse our product range here.

As with any Vitamin D product, it is recommended that you take your supplement on a daily basis to really feel its benefits. When you choose a liquid product, you will be able to take your Vitamin D by using the oral syringe provided with every bottle, allowing for quick and easy consumption.

If you choose our Liquid 2000 IU Vitamin D3, the recommended dose for adults is 0.5ml to 1ml daily, or as advised by a healthcare professional.