High Strength Vitamin D3 for Strong Bones, Steady Defences

1000iu (25µg) is a popular everyday strength, higher than the basic 400iu the NHS suggests as a general daily amount, and a common choice for year-round support. If you've been advised a higher dose, we also offer a 4000iu option.

Vitamin D contributes to the normal function of the immune system and to the maintenance of normal bones, teeth and muscle function. Reviewers most often take it through the darker "winter" months and for everyday immune support.

Many customers take it from October to March, when there's less sunlight, while some prefer to take it year-round. UK guidance suggests considering a Vitamin D supplement during the autumn and winter months, when sunlight exposure is limited.

Vitamin D supports normal immune function, muscle function and bone health, so many people top up when sunlight exposure is low, such as over autumn and winter, or if diet alone doesn't provide enough. If you're concerned about your levels, your GP can check and advise on the right approach.

Yes, Vitamin D is typically taken daily as part of a routine, particularly through the autumn and winter months. Our 1000iu tablets are formulated for everyday use, contributing to normal immune function, muscle function and the maintenance of normal bones and teeth.

Not quite, Vitamin D is the umbrella term, and D3 (cholecalciferol) is one form of it, generally regarded as the form most similar to what the body produces from sunlight. Our tablets provide Vitamin D in the D3 form at 1000iu (25µg) per serving.

Vitamin D is often recommended during pregnancy and breastfeeding, and 1000iu sits within levels many parents take through the year. That said, everyone's needs differ, so it is best to check with your GP, midwife or pharmacist before starting, especially if you are already taking a pregnancy multivitamin, so you can be sure of your total daily intake and stay comfortably within safe amounts.

These are common everyday pairings for bone health, and Vitamin D itself supports normal bones, teeth and muscle function. We also offer combined options, such as D3 plus K2, if you'd prefer them together in one tablet, check with your GP or pharmacist if you take other medication.

Vitamin D status is generally assessed with a simple test arranged through your GP, rather than by how you feel day to day. If you're concerned about your levels or aren't noticing any change, your GP or pharmacist can check and advise on next steps.

You can track your order using the link in your shipping confirmation email or by visiting your account page. UK standard delivery typically takes 2, 3 working days from dispatch. For international deliveries, please see our Shipping and Returns. If you need any further assistance, our Customer Care team is here to help at ask@justvitamins.co.uk.

UK standard delivery usually takes 2, 3 working days from dispatch (excluding weekends and bank holidays). For Next Day Delivery, please place your order by 1pm Monday, Friday for delivery on the next working day. You'll receive a tracking email as soon as your order has been dispatched, so we recommend checking your tracking information first if your order hasn't yet arrived.

If your order has not yet been dispatched, we'll do our best to help. Please contact our Customer Care team as soon as possible via email or live chat. Once an order has been dispatched, we're unfortunately unable to make changes or cancel it.

Yes. You can pause, skip, reschedule or cancel your subscription by logging into your account. Simply select Account at the top of the website and make any changes up to 3 days before your next scheduled dispatch.

We primarily serve customers in the UK, but we also deliver to selected international destinations. Please see our Shipping and Returns for the countries we currently ship to and applicable delivery charges.

We offer a 90-day hassle-free returns policy on unopened products. Return postage costs are the customer's responsibility unless the item is faulty or sent in error.

Our supplements are made in the UK in GMP-certified facilities to stringent quality standards. We carefully select our ingredients and carry out rigorous quality checks throughout the manufacturing process, so every product meets our high standards.

Every order is covered by our 90-day money-back guarantee. If you are not completely happy for any reason, contact our Customer Care team within 90 days of purchase and we will refund you, no awkward questions. It is our way of making it easy to try something new with confidence.