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theiCal-D3 1000mg/880IU - 30 Chewable Tablets

theiCal-D3 1000mg/880IU - 30 Chewable Tablets

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  • ✔️ Supports bone density and reduces osteoporosis risk in adults
  • ✔️ Combines 1000mg calcium with 880IU vitamin D3 per tablet
  • ✔️ Chewable format ideal for those who dislike swallowing tablets
  • ✔️ Vitamin D3 enhances calcium absorption for maximum bone benefit
  • ✔️ Suitable for adults with low dietary calcium or limited sun exposure

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What Is theiCal-D3 1000mg/880IU — a Calcium and Vitamin D Supplement?

 

theiCal-D3 1000mg/880IU is a chewable tablet combining calcium carbonate and colecalciferol (vitamin D3) to support bone health, muscle function, and overall wellbeing. Each tablet delivers 1000mg of calcium carbonate alongside 880IU of vitamin D3 — a pairing that the NHS recognises as important for maintaining healthy bones and teeth. If you've been told your vitamin D or calcium levels are low, or you're simply looking to support your bone health as you age, this could be a straightforward option worth considering. You can browse a wider range of bone and general health products in our vitamins and supplements collection.

Vitamin D deficiency is surprisingly common in the UK, particularly during autumn and winter when sunlight exposure is limited. The NHS advises that adults consider a daily vitamin D supplement of 10 micrograms (400IU) during these months, and higher doses may be appropriate for those at greater risk of deficiency. theiCal-D3 provides 880IU of vitamin D3 per tablet, making it suitable for people who need a slightly higher intake under medical guidance.

 

How Does theiCal-D3 Work to Support Bone Health?

 

The two active ingredients in theiCal-D3 work together in a complementary way. Calcium is the primary mineral in bone tissue, and an adequate daily intake is essential for maintaining bone density throughout life. Vitamin D3 plays a critical supporting role — without it, the body cannot absorb calcium efficiently from the gut, no matter how much you consume.

  • Calcium carbonate is broken down in the stomach to release elemental calcium, which is then absorbed into the bloodstream.
  • Vitamin D3 (colecalciferol) is converted in the liver and kidneys to its active form, calcitriol, which stimulates calcium absorption in the intestines.
  • Together, they help maintain serum calcium levels, support bone mineralisation, and contribute to normal muscle function.
  • Adequate calcium and vitamin D intake is associated with a reduced risk of osteoporosis and fractures, particularly in older adults.

 

Who Should Consider Using theiCal-D3 Chewable Tablets?

 

theiCal-D3 is designed for adults who need to supplement their calcium and vitamin D intake. It's particularly relevant for people who don't get enough of these nutrients through diet and sunlight alone. The chewable format makes it a practical choice for those who struggle to swallow standard tablets.

  • Adults over 50, especially postmenopausal women at increased risk of osteoporosis
  • People with limited sun exposure, including those who cover their skin or spend most of their time indoors
  • Individuals with low dietary calcium intake, such as those avoiding dairy products
  • People prescribed calcium and vitamin D as part of osteoporosis treatment or prevention

 

How Does theiCal-D3 Compare to Other Calcium and Vitamin D Supplements?

 

Feature theiCal-D3 1000mg/880IU Standard Calcium 500mg Tablet
Calcium dose per tablet 1000mg calcium carbonate 500mg calcium carbonate
Vitamin D3 included Yes — 880IU per tablet No (calcium only)
Format Chewable tablet Standard swallowable tablet
Suitable for those who dislike swallowing tablets Yes No

 

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

 

For many people, taking a calcium and vitamin D supplement like theiCal-D3 is a long-term commitment, particularly when it forms part of an osteoporosis management plan. Your GP or pharmacist will advise on how long you should continue, and periodic blood tests may be recommended to monitor calcium and vitamin D levels. It's worth noting that exceeding the recommended dose can lead to hypercalcaemia, so always stick to the stated amount unless a healthcare professional advises otherwise.

Store theiCal-D3 below 25°C in a dry place, away from direct sunlight and out of reach of children. Do not use after the expiry date printed on the packaging. If you're managing multiple health conditions, it's always sensible to review all your supplements together — you might also find it helpful to explore our women's health range, which includes products relevant to bone health and hormonal wellbeing.

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.

theiCal-D3 1000mg/880IU - 30 Chewable Tablets specifications
Treatment category Bone health / Vitamin D deficiency / Calcium supplementation
Active ingredient Calcium carbonate 1000mg, Colecalciferol (Vitamin D3) 880IU
Mechanism of action Provides elemental calcium for bone mineralisation; vitamin D3 enhances intestinal calcium absorption
Suitable for Adults requiring calcium and vitamin D supplementation
Pack size 30 chewable tablets
Strengths Calcium carbonate 1000mg / Colecalciferol 880IU (22 micrograms)
UK classification General Sale / Food supplement
Drug class Calcium and vitamin D supplement
Preparation Chewable tablet
Route of administration Oral

Specifications of theiCal-D3 1000mg/880IU - 30 Chewable Tablets

 

What Is theiCal-D3 and What Is It Used For?

 

theiCal-D3 1000mg/880IU chewable tablets contain two active ingredients: calcium carbonate and colecalciferol (vitamin D3). They are used to supplement calcium and vitamin D intake in adults where dietary sources and sunlight exposure are insufficient. The NHS recommends that everyone in the UK consider a vitamin D supplement during autumn and winter, and certain groups — including older adults, people with darker skin, and those who are housebound — are advised to take a supplement year-round. This product supports bone mineralisation, helps maintain normal muscle function, and contributes to the prevention of conditions such as osteoporosis and osteomalacia (softening of the bones).

 

What Do You Need to Know Before Using theiCal-D3?

 

Before starting theiCal-D3, it's important to check whether it is appropriate for you. Do not take this product if any of the following apply:

  • You have hypercalcaemia (abnormally high blood calcium levels)
  • You have hypercalciuria (excess calcium in the urine)
  • You have a history of kidney stones (nephrolithiasis), particularly calcium-containing stones
  • You have severe kidney disease or renal failure
  • You have hypervitaminosis D (vitamin D toxicity)
  • You are allergic to any of the ingredients

Certain medicines can interact with calcium and vitamin D supplements. Allow a gap of at least two hours between theiCal-D3 and the following:

  • Bisphosphonates (e.g. alendronic acid) — calcium can reduce their absorption
  • Tetracycline antibiotics — calcium binds to these and reduces their effectiveness
  • Levothyroxine (thyroid medication) — take at least four hours apart
  • Thiazide diuretics — may increase the risk of hypercalcaemia when combined with calcium supplements
  • Cardiac glycosides (e.g. digoxin) — hypercalcaemia can increase the risk of toxicity

 

How Should You Use theiCal-D3 Chewable Tablets?

 

Always use theiCal-D3 exactly as directed on the label or as advised by your doctor or pharmacist. The chewable format means you should chew the tablet thoroughly before swallowing — do not swallow it whole. Taking it with or after a meal can help improve calcium absorption and reduce the likelihood of digestive discomfort.

  1. Remove one tablet from the pack.
  2. Chew the tablet thoroughly in your mouth.
  3. Swallow after chewing, with a glass of water if needed.
  4. Take at the same time each day to help you remember.
  5. Do not take more than the recommended daily dose.
Indication Age Group Dose Frequency
Calcium and vitamin D supplementation Adults 1 chewable tablet (1000mg calcium / 880IU D3) Once daily
As directed by a healthcare professional Adults (higher need) Up to 2 tablets daily As advised — do not exceed without medical guidance

 

What Are the Possible Side Effects of theiCal-D3?

 

Like all supplements and medicines, theiCal-D3 can cause side effects in some people, though not everyone will experience them. If you're concerned about any reaction, speak to your pharmacist or GP. You might also find it useful to explore our pain relief range if you experience any discomfort.

Common side effects (may affect up to 1 in 10 people):

  • Constipation
  • Flatulence (wind)
  • Nausea
  • Stomach discomfort or bloating

Less common side effects (may affect up to 1 in 100 people):

  • Hypercalcaemia — symptoms include excessive thirst, frequent urination, confusion, or fatigue (usually only with excessive doses)
  • Hypercalciuria — excess calcium in the urine, which may increase kidney stone risk
  • Skin reactions such as rash or itching (possible allergic response)

Stop taking theiCal-D3 and seek medical advice promptly if you experience symptoms of hypercalcaemia or an allergic reaction.

 

How Should You Store theiCal-D3 Chewable Tablets?

 

  • Store below 25°C in a cool, dry place
  • Keep away from direct sunlight and moisture
  • Keep out of the sight and reach of children
  • Do not use after the expiry date printed on the packaging
  • Do not store in the bathroom or near a sink — humidity can affect the tablets
  • Do not dispose of medicines via wastewater or household waste — return unused tablets to your pharmacy

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 theiCal-D3 1000mg/880IU online in the UK?

You can buy theiCal-D3 1000mg/880IU chewable tablets directly from Cured Pharmacy, a GPhC-registered UK online pharmacy. It is available without a prescription and can be ordered conveniently from our vitamins and supplements collection. No GP referral is needed for this over-the-counter supplement.

How does theiCal-D3 work in the body?

Calcium carbonate in theiCal-D3 is broken down in the stomach to release elemental calcium, which is absorbed into the bloodstream and used for bone mineralisation and muscle function. The vitamin D3 (colecalciferol) component is converted in the liver and kidneys to its active form, calcitriol, which stimulates calcium absorption in the intestines. Together, these two nutrients work in tandem to maintain healthy bones and support normal physiological processes.

How do I use theiCal-D3 chewable tablets step by step?

Take one tablet daily, chewing it thoroughly before swallowing — do not swallow the tablet whole. It is best taken with or after a meal to improve calcium absorption and reduce the chance of stomach discomfort. Try to take it at the same time each day to build a consistent routine.

What is the best time of day to take theiCal-D3?

There is no single "best" time, but taking theiCal-D3 with a meal — such as breakfast or lunch — can help improve calcium absorption and reduce the risk of nausea or bloating. If you are also taking other medicines such as bisphosphonates or levothyroxine, you must leave a gap of at least two to four hours between those medicines and theiCal-D3. Consistency is key, so choose a time that fits naturally into your daily routine.

What are the side effects of theiCal-D3 and how do I manage them?

The most common side effects are constipation, flatulence, nausea, and stomach discomfort — these are generally mild and often improve once your body adjusts. Taking the tablet with food and drinking plenty of water can help reduce digestive side effects. If you experience symptoms of high blood calcium such as excessive thirst, confusion, or fatigue, stop taking the supplement and speak to your GP promptly.

Who is eligible to take theiCal-D3 chewable tablets?

theiCal-D3 is suitable for adults who need to supplement their calcium and vitamin D intake, including older adults, postmenopausal women, people with limited sun exposure, and those with low dietary calcium. It is not suitable for people with hypercalcaemia, hypercalciuria, severe kidney disease, or a history of calcium kidney stones. Always check with your pharmacist or GP if you are unsure whether this supplement is right for you.

What happens if I miss a dose of theiCal-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 compensate for a missed dose. Missing the occasional dose is unlikely to cause any harm, but try to maintain a consistent daily routine for the best results.

Can I take theiCal-D3 if I am pregnant or breastfeeding?

Calcium and vitamin D are important nutrients during pregnancy and breastfeeding, but the appropriate dose may differ from standard adult supplementation. The NHS recommends that pregnant and breastfeeding women take a vitamin D supplement of 10 micrograms (400IU) daily, so the 880IU dose in theiCal-D3 may be higher than routinely recommended without medical advice. Always consult your midwife, GP, or pharmacist before taking this product during pregnancy or whilst breastfeeding.

What medicines interact with theiCal-D3?

theiCal-D3 can interact with several medicines, including bisphosphonates (e.g. alendronic acid), tetracycline antibiotics, levothyroxine, thiazide diuretics, and cardiac glycosides such as digoxin. Calcium can reduce the absorption of these medicines if taken at the same time, so a gap of at least two to four hours is recommended. Always tell your pharmacist about all medicines and supplements you are taking before starting theiCal-D3.

How long can you take theiCal-D3 for?

theiCal-D3 can be taken long-term when recommended by a healthcare professional, particularly for people managing osteoporosis or at ongoing risk of vitamin D deficiency. Your GP may arrange periodic blood tests to check your calcium and vitamin D levels during prolonged use. Do not continue indefinitely without occasional review, as excessive long-term intake can lead to hypercalcaemia.

Is theiCal-D3 suitable for vegetarians or vegans?

The suitability of theiCal-D3 for vegetarians or vegans depends on the source of the colecalciferol (vitamin D3) used, as vitamin D3 is commonly derived from lanolin (sheep's wool). Check the product packaging or contact the manufacturer directly to confirm whether the vitamin D3 source is animal-derived or plant-based. If you follow a vegan diet, you may wish to look for a supplement using vitamin D3 derived from lichen, which is plant-based.

What are the alternatives to theiCal-D3 for bone health?

Alternatives include other combined calcium and vitamin D supplements available in tablet, effervescent, or sachet form, as well as standalone vitamin D3 supplements if your calcium intake from diet is already adequate. For people with osteoporosis, prescription medicines such as bisphosphonates may also be recommended alongside supplementation. Browse our vitamins and supplements range to compare available options.

Can children take theiCal-D3 1000mg/880IU tablets?

theiCal-D3 at this dose is formulated for adults and is not recommended for children without specific medical advice. Children have different calcium and vitamin D requirements depending on their age, and separate paediatric formulations are available. If you are concerned about your child's vitamin D or calcium intake, speak to your GP or health visitor for appropriate guidance.

Does theiCal-D3 help with muscle weakness or fatigue?

Vitamin D deficiency is associated with muscle weakness, fatigue, and bone pain, and correcting a deficiency with a supplement like theiCal-D3 can help alleviate these symptoms over time. Calcium also plays a role in normal muscle contraction, so maintaining adequate levels supports overall muscle function. However, if you are experiencing significant fatigue or muscle weakness, it is important to see your GP to rule out other underlying causes.

What are the latest findings on calcium and vitamin D supplementation?

Current NHS and NICE guidance continues to support calcium and vitamin D supplementation for people at risk of deficiency and those with or at risk of osteoporosis. Research has consistently shown that combined calcium and vitamin D supplementation reduces the risk of fractures in older adults, particularly those in care settings. Ongoing studies continue to explore the wider roles of vitamin D in immune function and cardiovascular health, though supplementation for these purposes is not yet routinely recommended by the NHS.

How Should You Use theiCal-D3 Chewable Tablets?

theiCal-D3 chewable tablets are designed to be chewed thoroughly before swallowing — do not swallow them whole like a standard tablet. Taking them with or after a meal helps improve calcium absorption and reduces the likelihood of digestive discomfort such as bloating or nausea.

What Is the Correct Dose of theiCal-D3?

The standard adult dose is one chewable tablet per day, providing 1000mg of calcium carbonate and 880IU of vitamin D3. In some cases, a healthcare professional may recommend a higher dose — always follow their specific guidance and do not self-increase your dose without advice.

When Is the Best Time to Use theiCal-D3?

There is no strict requirement to take theiCal-D3 at a specific time of day, but taking it with a meal — such as breakfast or lunch — is generally recommended. Calcium absorption is enhanced in the presence of food, and taking it alongside a meal also reduces the chance of stomach upset. If you are taking other medicines that interact with calcium (such as bisphosphonates, levothyroxine, or tetracycline antibiotics), ensure you leave a gap of at least two to four hours between those medicines and theiCal-D3.

How Long Can You Use theiCal-D3 For?

For many people, theiCal-D3 is taken as part of a long-term health management plan, particularly when prescribed alongside osteoporosis treatment or for ongoing vitamin D deficiency. Your GP or pharmacist will advise on the appropriate duration for your individual circumstances. Periodic monitoring of blood calcium and vitamin D levels is advisable during prolonged use to ensure levels remain within a safe range and to avoid the risk of hypercalcaemia from excessive intake.

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

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What Are the Most Common Side Effects of theiCal-D3?

Most people tolerate theiCal-D3 well, but some individuals may experience mild digestive side effects, particularly when first starting the supplement. These are generally not serious and often settle with continued use.

  • Constipation
  • Flatulence (wind)
  • Nausea
  • Stomach discomfort or bloating
  • Abdominal pain (mild)

Taking the tablet with food and drinking adequate water throughout the day can help reduce these effects. If constipation becomes troublesome, speak to your pharmacist about suitable management options.

What Are the Less Common Side Effects of theiCal-D3?

Less commonly, some people may experience side effects related to elevated calcium levels, particularly if the recommended dose is exceeded. These are more likely in people with underlying kidney conditions or those taking interacting medicines.

  • Hypercalcaemia — symptoms include excessive thirst, frequent urination, fatigue, confusion, and muscle weakness
  • Hypercalciuria — excess calcium in the urine, which may increase the risk of kidney stones
  • Headache
  • Dry mouth
  • Skin rash or itching (possible allergic reaction)

What Are the Serious Side Effects of theiCal-D3?

Serious side effects are rare when theiCal-D3 is taken at the recommended dose. However, vitamin D toxicity (hypervitaminosis D) can occur with prolonged excessive intake and may cause symptoms including nausea, vomiting, weakness, and in severe cases, kidney damage. Hypercalcaemia, if left untreated, can also lead to serious complications including cardiac arrhythmias. Stop taking theiCal-D3 immediately and seek urgent medical attention if you experience severe symptoms such as confusion, irregular heartbeat, or significant muscle weakness.

What Should You Do If You Experience Side Effects of theiCal-D3?

For mild digestive side effects, try taking the tablet with a larger meal and increasing your fluid intake. If side effects persist or worsen, stop taking the supplement and consult your pharmacist or GP. You should report any suspected serious side effects to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk. Do not restart the supplement without medical advice if you have experienced a serious reaction.

Can theiCal-D3 Interact With Other Medicines?

Yes — calcium and vitamin D supplements can interact with a number of commonly prescribed medicines. Calcium can reduce the absorption of bisphosphonates (e.g. alendronic acid), tetracycline antibiotics, and levothyroxine if taken at the same time, so a gap of at least two to four hours is recommended. Thiazide diuretics can increase the risk of hypercalcaemia when combined with calcium supplements, and cardiac glycosides such as digoxin may become more toxic in the presence of elevated calcium levels. Always inform your pharmacist or GP of all medicines and supplements you are taking before starting theiCal-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

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