Vitamin D3 4000 IU — 365 Micro-Tablets, a full year's supply at one tablet daily.
- Vitamin D contributes to the maintenance of normal bones, teeth and the normal function of the immune system
- Vitamin D contributes to the maintenance of normal muscle function
- Vitamin D contributes to normal absorption/utilisation of calcium and phosphorus
High-Strength Vitamin D3 — A Full Year in One Bottle
Through British autumns and winters, sunlight is in short supply — and with it, the vitamin D the skin would otherwise produce. This formulation delivers 4000 IU (100µg) of vitamin D3 per tablet, in easy-to-swallow micro-tablet form, with 365 tablets per bottle — a full twelve months of daily supplementation in a single purchase. At 2000% of the nutrient reference value, this is a high-strength product; its use is recommended under the guidance of a healthcare professional or pharmacist. Suitable for vegetarians.
Why People Choose Vitamin D3 4000 IU
- ✓ Vitamin D contributes to normal blood calcium levels and to cell division
- ✓ A full year's supply in one bottle — one annual purchase, twelve months of consistency
- ✓ 4000 IU per tablet — for those supplementing at higher strength under health professional guidance
- ✓ Easy-to-swallow micro-tablet format
- ✓ Manufactured in the UK to GMP Code of Practice and ISO 9001
- ✓ Suitable for vegetarians; gluten free
More Than a Standard Vitamin D Supplement
Most vitamin D supplements come in 1000 IU or 2000 IU formats. This product is for those who, following advice from a GP, nutritionist or other healthcare professional, are supplementing at the 4000 IU level. The micro-tablet format makes it easy to take daily — the tablets are small enough to be taken with or without water. At 365 tablets, a single bottle provides a complete calendar year of daily supplementation. Suitable for vegetarians; not suitable for vegans (cholecalciferol is derived from lanolin).
Making It Part of Your Daily Routine
One micro-tablet daily with food and water. With a year's supply in the bottle, a single purchase covers every month — no gaps in winter when vitamin D synthesis from sunlight is absent, no mid-month reorders. Many people take their vitamin D supplement at breakfast as part of a morning routine. Vitamin D is fat-soluble, so taking it alongside a meal that contains some fat supports its normal absorption. Available as a one-off purchase or on subscription.
Vitamin D3 in Context
Vitamin D3 (cholecalciferol) is the form produced naturally in the skin in response to UVB sunlight. In the UK, significant skin production of vitamin D is only possible during the summer months; through autumn and winter the sun angle is too low for this to occur at most UK latitudes. Public Health England and the NHS recommend vitamin D supplementation through autumn and winter for most adults, and year-round for certain groups. The 4000 IU strength sits at the upper reference level cited by the European Food Safety Authority — above the level appropriate for general unsupervised use. For this reason, use is recommended under appropriate health professional guidance, particularly for those with existing health conditions or those who take medication.
Inside the Formula
Vitamin D3 (Cholecalciferol) 100µg (4000 IU) — 2000% NRV — vitamin D contributes to the maintenance of normal bones, teeth and muscle function; to the normal function of the immune system; to normal absorption/utilisation of calcium and phosphorus; to normal blood calcium levels; and to cell division.
Other Ingredients — Bulking Agents: Microcrystalline Cellulose, Di-Calcium Phosphate; Vitamin D Prep: Acacia Gum, Sucrose, Sunflower Oil, Corn Starch, Cholecalciferol; Anti-Caking Agents: Magnesium Stearate, Silicon Dioxide. Gluten free. Suitable for vegetarians. Not suitable for vegans.
Swiss BioEnergetics
Trusted UK Manufacturing — made at a GMP Code of Practice facility and certified to ISO 9001, with quality that's independently audited throughout production.
Clean, Potent Ingredients — We use established ingredient forms at the doses specified in each formulation, with no unnecessary fillers where they can be avoided.
Evidence-Inspired Formulas — each product is developed against the published nutritional science and well-established GB-register health effects for the nutrients it contains.
30-Day Guarantee
If you're not satisfied with your purchase for any reason, contact us within 30 days and we'll make it right. Swiss BioEnergetics products are made to a standard we stand behind.
Frequently Asked Questions
Is this product suitable for vegans?
No. The vitamin D3 (cholecalciferol) is derived from lanolin, which comes from sheep's wool. The product is suitable for vegetarians. A vegan alternative is the Swiss BioEnergetics Vegan Vitamin D3 1000 IU.
Is 4000 IU safe to take daily?
4000 IU is at the upper reference level cited by the European Food Safety Authority. It is a high-strength dose and is recommended for use under the guidance of a healthcare professional or pharmacist. If you are unsure whether this strength is right for you, speak with your GP before starting.
How long does one bottle last?
At one tablet per day, the 365-tablet bottle is a full twelve-month supply.
When should I take it?
Take one tablet daily with food and water. Vitamin D is fat-soluble, so taking it with a meal that contains some fat supports its normal absorption.
Can I take this if I am pregnant or breastfeeding?
Pregnant or breastfeeding women should consult a healthcare practitioner before use. This is a high-strength product and medical supervision is particularly important during pregnancy and breastfeeding.
