Skip to product information
1 of 1

  • Images are for illustration purposes only

Solgar Vitamin D3 (Cholecalciferol) 1000 IU (25 mcg) - 90 Tablets

Solgar Vitamin D3 (Cholecalciferol) 1000 IU (25 mcg) - 90 Tablets

  • 1. Ozempic®️-equivalent therapy now available for weight management
  • 2. Average weight loss of 17%, with 1 in 3 patients achieving over 20%
  • 3. May help reduce osteoarthritis-related pain
  • 4. Wegovy®️ is not expected to impact the effectiveness of oral contraceptives
  • 5. Supports cardiovascular risk reduction
  • 6. Over 22 million patients treated with semaglutide-based therapies since 2018

  • ✔️ Supports bone strength and calcium absorption daily
  • ✔️ Helps maintain normal immune system function year-round
  • ✔️ Cholecalciferol form — most efficiently absorbed by the body
  • ✔️ Ideal for adults with limited UK sunlight exposure
  • ✔️ 90-tablet supply provides three months of daily support

Price Checker

Regular price £4.99
Sale price £4.99
Sale Sold out
  • Lowest price guarantee
  • Includes FREE private prescription
View full details

 

What Is Vitamin D3 1000 IU and Why Do You Need It?

 

If you live in the UK, there is a good chance you are not getting enough vitamin D — especially between October and March. The NHS advises that everyone should consider taking a daily vitamin D supplement during the autumn and winter months, because sunlight in the UK is simply not strong enough for your skin to make sufficient amounts. Vitamin D3 1000 IU from Solgar provides 25 mcg of cholecalciferol per tablet, a well-studied form of vitamin D that your body uses efficiently. At just £4.99 for 90 tablets, it is one of the most cost-effective ways to maintain healthy levels year-round.

Vitamin D plays a role in far more than just bone health. It contributes to normal muscle function, supports the immune system, and helps regulate calcium and phosphate levels in the blood. Deficiency is surprisingly common — particularly in older adults, people with darker skin tones, and those who spend most of their time indoors. If you are looking to support your overall wellbeing, browsing our full range of vitamins and supplements is a great place to start.

 

How Does Solgar Vitamin D3 Work in the Body?

 

Cholecalciferol — the form of vitamin D found in this supplement — is the same form your skin produces when exposed to UVB sunlight. Once ingested, it undergoes two conversion steps:

  • First, the liver converts cholecalciferol into calcidiol (25-hydroxyvitamin D), the main circulating form measured in blood tests.
  • Next, the kidneys convert calcidiol into calcitriol (1,25-dihydroxyvitamin D), the biologically active hormone.
  • Calcitriol then binds to vitamin D receptors throughout the body, regulating calcium absorption in the gut and supporting bone mineralisation.
  • It also modulates immune cell activity, which is why adequate vitamin D levels are linked to normal immune function.

Research consistently shows that cholecalciferol (D3) raises blood 25-hydroxyvitamin D levels more effectively than ergocalciferol (D2), making it the preferred form for supplementation.

 

Who Should Consider Taking Solgar Vitamin D3 1000 IU?

 

This supplement is suitable for a wide range of adults. The NHS specifically identifies several groups who are at higher risk of vitamin D deficiency and who may benefit from daily supplementation:

  • Adults who spend little time outdoors or work indoors during daylight hours
  • People with darker skin tones, as more melanin reduces the skin's ability to synthesise vitamin D from sunlight
  • Adults over 65, whose skin is less efficient at producing vitamin D
  • Individuals who cover most of their skin when outdoors for cultural or personal reasons
  • Those who have been told by their GP that their vitamin D levels are low

It is not recommended for children under 12 without specific medical advice, as paediatric dosing differs from adult requirements.

 

How Does Solgar Vitamin D3 Compare to Other Vitamin D Supplements?

 

Feature Solgar Vitamin D3 1000 IU Generic Vitamin D2 (Ergocalciferol)
Active ingredient Cholecalciferol (D3) Ergocalciferol (D2)
Efficacy at raising serum levels More effective at raising 25(OH)D Less effective, shorter duration
Source Lanolin (sheep's wool) Plant/fungal (vegan-friendly)
Dose per tablet 1000 IU (25 mcg) Varies by product
Tablet count 90 tablets Varies

 

Is Solgar Vitamin D3 Suitable for Long-Term Use and How Should It Be Stored?

 

For most healthy adults, taking vitamin D3 1000 IU daily is considered safe for long-term use at this dose. The NHS advises that 10 mcg (400 IU) is the minimum recommended daily amount, and 1000 IU (25 mcg) falls well within the safe upper range for adults. However, you should not take doses above 100 mcg (4,000 IU) per day without medical supervision, as this can lead to vitamin D toxicity over time.

Store your tablets below 25°C in a cool, dry place away from direct sunlight. Keep the bottle tightly closed and out of reach of children. Do not use after the expiry date printed on the label. If you are managing other health conditions alongside your supplement routine, you might also find our women's health range useful for complementary support products.

This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Solgar Vitamin D3 (Cholecalciferol) 1000 IU (25 mcg) - 90 Tablets specifications
Treatment category Vitamin D deficiency prevention; bone, muscle, and immune support
Mechanism of action Converted to calcitriol in liver and kidneys; regulates calcium absorption and immune function
Effective for Maintaining adequate vitamin D levels in adults
Suitable for Adults 18 years and over
Active ingredient Cholecalciferol (Vitamin D3)
Pack size 90 tablets
Strength 1000 IU (25 mcg) per tablet
UK classification Food supplement (not a licensed medicine)
Drug class Fat-soluble vitamin
Preparation Tablet
Route of administration Oral

Specifications of Solgar Vitamin D3 (Cholecalciferol) 1000 IU (25 mcg) - 90 Tablets

 

What Is Solgar Vitamin D3 and What Is It Used For?

 

Solgar Vitamin D3 (Cholecalciferol) 1000 IU is a food supplement providing 25 mcg of cholecalciferol per tablet. It is used to help maintain adequate vitamin D levels in adults, particularly during autumn and winter when sunlight exposure in the UK is insufficient for the skin to produce enough vitamin D naturally. Vitamin D contributes to the normal absorption of calcium and phosphorus, the maintenance of normal bones and teeth, normal muscle function, and the normal function of the immune system. It also plays a role in the process of cell division.

 

What Do You Need to Know Before Using Solgar Vitamin D3?

 

Before starting this supplement, it is important to be aware of the following contraindications and warnings:

  • Do not take if you have hypercalcaemia (high calcium levels in the blood) or hypercalciuria (high calcium in the urine)
  • Do not use if you have sarcoidosis, as this condition can increase sensitivity to vitamin D
  • Use with caution if you have kidney disease or kidney stones, as vitamin D affects calcium metabolism
  • Do not exceed 100 mcg (4,000 IU) of vitamin D per day from all sources combined without medical supervision
  • Consult your GP before use if you are pregnant or breastfeeding, as requirements may differ
  • Not recommended for children under 12 without specific medical advice

The following medicines may interact with vitamin D3 supplements:

  • Thiazide diuretics (e.g. bendroflumethiazide) — may increase the risk of hypercalcaemia when taken alongside vitamin D
  • Digoxin and other cardiac glycosides — hypercalcaemia caused by excess vitamin D can increase the risk of cardiac arrhythmias
  • Corticosteroids (e.g. prednisolone) — may reduce the absorption and effectiveness of vitamin D
  • Orlistat — reduces absorption of fat-soluble vitamins including vitamin D3
  • Anticonvulsants (e.g. phenytoin, carbamazepine) — may increase the breakdown of vitamin D in the body

 

How Should You Use Solgar Vitamin D3 Correctly?

 

Using this supplement correctly is straightforward. Follow these steps:

  1. Take one tablet daily, unless otherwise directed by your GP or pharmacist.
  2. Swallow the tablet whole with a full glass of water.
  3. Take with a meal that contains some fat, as vitamin D3 is fat-soluble and absorption is improved with dietary fat.
  4. Do not crush or chew the tablet unless the label specifically states this is acceptable.
  5. Do not take more than one tablet per day unless advised by a healthcare professional.
Indication Age Group Dose Frequency
General maintenance / prevention of deficiency Adults 18+ 1000 IU (25 mcg) Once daily
Autumn/winter supplementation (NHS guidance) Adults 18+ 400–1000 IU (10–25 mcg) Once daily
Treatment of confirmed deficiency Adults (under medical supervision) Higher doses as prescribed As directed by GP
Children under 12 Not recommended without medical advice

 

What Are the Possible Side Effects of Solgar Vitamin D3?

 

At the recommended dose of 1000 IU (25 mcg) daily, side effects are uncommon. However, taking too much vitamin D over a prolonged period can cause vitamin D toxicity (hypervitaminosis D), which leads to hypercalcaemia. If you are also taking other supplements containing vitamin D, make sure your total daily intake does not exceed 100 mcg (4,000 IU). You can explore our vitamins and supplements range to check for any overlap in your current supplement routine.

Common side effects (associated with excessive intake):

  • Nausea and vomiting
  • Loss of appetite
  • Constipation
  • Fatigue and weakness

Less common side effects (associated with hypercalcaemia from prolonged excessive intake):

  • Frequent urination and excessive thirst
  • Confusion or disorientation
  • Muscle weakness or bone pain
  • Kidney stones in susceptible individuals
  • Irregular heartbeat (particularly in those taking digoxin)

Stop taking the supplement and seek medical advice if you experience any of the above symptoms. At the standard 1000 IU daily dose, these effects are very unlikely in otherwise healthy adults.

 

How Should You Store Solgar Vitamin D3 Safely?

 

Proper storage helps maintain the quality and potency of your supplement throughout its shelf life. Follow these storage guidelines:

  • Store below 25°C in a cool, dry place
  • Keep away from direct sunlight and sources of heat
  • Keep the bottle tightly closed after each use
  • Store out of sight and reach of children and pets
  • Do not store in the bathroom or near a sink, as moisture can degrade the tablets
  • Do not use after the expiry date printed on the bottom of the bottle
  • Do not transfer tablets to a different container unless advised to do so

If you are unsure whether your tablets are still suitable to use, speak to your pharmacist. For those managing multiple health conditions, our men's health range includes additional products that may complement your supplement routine.

Written and reviewed by our qualified team

Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy Solgar Vitamin D3 1000 IU online in the UK?

You can buy Solgar Vitamin D3 1000 IU (25 mcg) 90 tablets directly from Cured Pharmacy, a GPhC-registered UK online pharmacy, for just £4.99. No prescription is needed, as this is an over-the-counter food supplement. You can also browse our wider vitamins and supplements range for complementary products.

How does vitamin D3 1000 IU work in the body?

Cholecalciferol is absorbed from the gut and transported to the liver, where it is converted to calcidiol (25-hydroxyvitamin D). The kidneys then convert this into calcitriol, the active form that regulates calcium absorption, supports bone mineralisation, and modulates immune cell activity. This two-step conversion process is why D3 is considered the most efficient supplemental form of vitamin D.

How do I take Solgar Vitamin D3 tablets step by step?

Take one tablet daily with a meal that contains some fat, as vitamin D3 is fat-soluble and is absorbed more effectively alongside dietary fat. Swallow the tablet whole with a full glass of water, and try to take it at the same time each day to build a consistent habit. Do not take more than one tablet per day unless your GP has specifically advised a higher dose.

What is the best time of day to take vitamin D3 supplements?

There is no single "correct" time, but most people find taking vitamin D3 with breakfast or lunch works well, particularly if those meals contain some fat. Taking it in the morning also means you are less likely to forget it. Some people prefer to take it with their evening meal — either approach is fine as long as you are consistent.

Who is eligible to take Solgar Vitamin D3 1000 IU?

This supplement is suitable for adults aged 18 and over who want to maintain healthy vitamin D levels, particularly those with limited sun exposure, darker skin tones, or who are over 65. It is not recommended for children under 12 without specific medical advice, as paediatric vitamin D requirements and dosing differ from adults. Always speak to your GP or pharmacist if you are unsure whether this supplement is right for you.

What are the side effects of taking vitamin D3 1000 IU daily?

At the recommended dose of 1000 IU (25 mcg) per day, side effects are very rare in healthy adults. Problems are more likely to occur if you take much higher doses over a long period, which can lead to hypercalcaemia — symptoms include nausea, fatigue, frequent urination, and confusion. If you experience any of these, stop taking the supplement and speak to your GP promptly.

What happens if I miss a dose of Solgar Vitamin D3?

If you forget to take your tablet, take it as soon as you remember — unless it is nearly time for your next dose, in which case simply skip the missed one and carry on as normal. Never take two tablets at once to make up for a missed dose. Because vitamin D3 is fat-soluble and stored in body fat, an occasional missed dose is unlikely to have a significant impact on your levels.

Can I take Solgar Vitamin D3 if I am pregnant or breastfeeding?

The NHS recommends that pregnant and breastfeeding women take a daily vitamin D supplement of at least 10 mcg (400 IU). A dose of 1000 IU (25 mcg) is generally considered safe during pregnancy, but you should always consult your midwife or GP before starting any new supplement during pregnancy or while breastfeeding. They can advise on the most appropriate dose for your individual circumstances.

How long should you take vitamin D3 supplements for?

The NHS recommends that everyone in the UK considers taking a daily vitamin D supplement throughout autumn and winter (October to March). People at higher risk of deficiency — including older adults, those with darker skin, and people who spend little time outdoors — may benefit from supplementing year-round. If your GP has confirmed a deficiency, they will advise on the appropriate duration and dose for your situation.

Does vitamin D3 interact with any medicines?

Yes, vitamin D3 can interact with certain medicines. Thiazide diuretics may increase the risk of hypercalcaemia when combined with vitamin D supplements, and digoxin users should be cautious as raised calcium levels can affect heart rhythm. Orlistat reduces absorption of fat-soluble vitamins including D3, and anticonvulsants such as phenytoin can speed up the breakdown of vitamin D in the body. Always tell your pharmacist about all medicines and supplements you are taking.

Is Solgar Vitamin D3 suitable for vegans?

Standard Solgar Vitamin D3 (cholecalciferol) is derived from lanolin, which comes from sheep's wool, so it is not suitable for vegans. If you follow a vegan diet, you should look for a vitamin D3 supplement derived from lichen, which is a plant-based source of cholecalciferol. Alternatively, vitamin D2 (ergocalciferol) is vegan-friendly, though research suggests D3 is more effective at raising serum vitamin D levels.

What are the alternatives to Solgar Vitamin D3 1000 IU?

Alternatives include other brands of cholecalciferol tablets at 400 IU or 1000 IU, vitamin D3 soft gel capsules, vitamin D3 drops (useful for those who struggle to swallow tablets), and combination supplements containing both vitamin D3 and vitamin K2. Vitamin D2 (ergocalciferol) is a vegan alternative, though it is generally considered less effective at maintaining serum levels. You can compare options in our vitamins and supplements collection.

How do I know if I am vitamin D deficient?

The only reliable way to confirm vitamin D deficiency is through a blood test measuring your serum 25-hydroxyvitamin D level. Your GP can arrange this if you have symptoms such as persistent fatigue, bone or muscle pain, or frequent infections. In the UK, a level below 25 nmol/L is generally considered deficient, while 25–50 nmol/L is considered insufficient for most people.

What are the latest studies on vitamin D3 supplementation?

Recent research has continued to explore vitamin D's role beyond bone health, including its potential influence on immune regulation, cardiovascular health, and mood. The VITAL trial and other large studies have provided mixed results regarding vitamin D supplementation and disease prevention, suggesting that benefits may be most pronounced in those who are genuinely deficient. Current NHS and NICE guidance focuses on supplementation for deficiency prevention rather than disease treatment.

Can I take vitamin D3 alongside other vitamins and supplements?

Yes, vitamin D3 is commonly taken alongside other supplements such as calcium, magnesium, and vitamin K2, which work synergistically to support bone health. However, you should be careful not to exceed a total daily vitamin D intake of 100 mcg (4,000 IU) from all sources combined. Always check the labels of any other supplements you are taking and speak to your pharmacist if you are unsure about combining products.

How Should You Use Solgar Vitamin D3 1000 IU?

Using this supplement correctly is simple, but consistency is key. Vitamin D3 is a fat-soluble vitamin, which means your body absorbs it most efficiently when taken alongside food that contains some fat. Follow these steps each day to get the most from your supplement:

If you have difficulty swallowing tablets, speak to your pharmacist about alternative formulations such as drops or soft gel capsules.

What Is the Correct Dose of Solgar Vitamin D3 1000 IU?

The standard adult dose is one tablet (1000 IU / 25 mcg) per day. This dose is consistent with NHS guidance for adults who want to maintain adequate vitamin D levels, particularly during autumn and winter. Do not exceed this dose without advice from your GP, as taking too much vitamin D over a prolonged period can cause harm.

When Is the Best Time to Use Solgar Vitamin D3?

There is no strict rule about timing, but taking your vitamin D3 tablet with your morning or midday meal tends to work best for most people. Because it is fat-soluble, pairing it with a meal that contains some dietary fat — such as eggs, nuts, or olive oil — helps your body absorb it more effectively. Taking it earlier in the day also makes it easier to remember as part of your morning routine.

Avoid taking it on an empty stomach if possible, as absorption may be reduced. Some people prefer to take it with their evening meal, which is also perfectly acceptable — the most important thing is consistency.

How Long Can You Use Solgar Vitamin D3 For?

For most adults in the UK, the NHS recommends taking a vitamin D supplement throughout autumn and winter as a minimum. If you are in a higher-risk group — such as being over 65, having darker skin, or spending most of your time indoors — year-round supplementation at 1000 IU daily is generally considered safe and appropriate. If your GP has confirmed a vitamin D deficiency through a blood test, they will advise on the specific duration and dose required for your situation.

Long-term use at 1000 IU (25 mcg) per day is well within the safe upper limit of 4,000 IU (100 mcg) per day for adults. However, it is good practice to have your vitamin D levels checked periodically if you are supplementing long-term, particularly if you are also taking other supplements or medicines that affect vitamin D metabolism.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

Customer Reviews

Be the first to write a review
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)

What Are the Most Common Side Effects of Solgar Vitamin D3 1000 IU?

At the recommended dose of 1000 IU (25 mcg) per day, side effects from Solgar Vitamin D3 are very uncommon in healthy adults. The vast majority of people tolerate this supplement without any problems at all. Side effects are almost always associated with taking doses that are significantly higher than recommended over a prolonged period, rather than with standard daily supplementation.

  • Nausea or stomach discomfort (usually only with very high doses)
  • Loss of appetite
  • Constipation
  • Headache

What Are the Less Common Side Effects of Solgar Vitamin D3?

Less common side effects are typically linked to hypercalcaemia — a condition where calcium levels in the blood become too high. This is almost exclusively a concern with prolonged use of doses well above the recommended daily amount. If you are taking multiple supplements that contain vitamin D, make sure your total daily intake does not exceed 100 mcg (4,000 IU).

  • Excessive thirst and frequent urination
  • Fatigue and general weakness
  • Muscle or bone pain
  • Confusion or difficulty concentrating
  • Kidney stones in susceptible individuals

What Are the Serious Side Effects of Solgar Vitamin D3?

Serious side effects from vitamin D3 supplementation at 1000 IU daily are extremely rare. However, if you have an underlying condition such as sarcoidosis, hyperparathyroidism, or kidney disease, you may be more sensitive to the effects of vitamin D and should only supplement under medical supervision. In people taking digoxin or other cardiac glycosides, hypercalcaemia caused by excessive vitamin D intake can increase the risk of cardiac arrhythmias — this is a serious concern that warrants medical advice before starting supplementation.

  • Severe hypercalcaemia (very high blood calcium) — requires urgent medical attention
  • Cardiac arrhythmias in those taking digoxin
  • Kidney damage with prolonged excessive intake

What Should You Do If You Experience Side Effects of Vitamin D3?

If you notice any symptoms that you think may be related to your vitamin D3 supplement — particularly nausea, excessive thirst, frequent urination, confusion, or muscle weakness — stop taking the supplement and contact your GP or pharmacist promptly. These symptoms could indicate that your calcium levels are too high and need to be checked with a blood test. Do not restart supplementation until you have received medical advice.

For mild digestive discomfort, try taking the tablet with a larger meal. If symptoms persist, speak to your pharmacist about whether an alternative formulation might suit you better.

Can Solgar Vitamin D3 Interact With Other Medicines?

Yes, vitamin D3 can interact with several medicines. Thiazide diuretics (such as bendroflumethiazide) can increase the risk of hypercalcaemia when taken alongside vitamin D supplements. Digoxin and other cardiac glycosides carry an increased risk of arrhythmias if calcium levels rise. Orlistat reduces the absorption of fat-soluble vitamins including D3, meaning supplementation may be less effective. Anticonvulsants such as phenytoin and carbamazepine can accelerate the breakdown of vitamin D in the body, potentially reducing its effectiveness. Corticosteroids may also impair vitamin D absorption and metabolism. Always inform your pharmacist or GP of all medicines and supplements you are currently taking before starting vitamin D3.

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

We’re a safe and
regulated UK service

Registered Pharmacy Badge

Lowest Price Guarantee

We're convinced you won't find your treatment cheaper, but if you do we'll refund the difference.

Find out more

100% discreet packaging

We're convinced you won't find your treatment cheaper, but if you do we'll refund the difference.

Find out more

Agent

Need help?
Talk to our friendly experts now

How our service works

Service Setup

Service setup

Discreet Packaging

Discreet packaging

Express Delivery

Express delivery