Vitamin D3 for Stronger Bones, Steady Defences

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 as a simple daily addition to their routine.

400iu (10µg) is the general daily amount UK health guidance suggests for most adults, making it a sensible everyday choice, including for older adults. If you've been advised more, we also offer 1000iu and 4000iu.

UK guidance suggests considering a Vitamin D supplement in autumn and winter, when there's less sunlight. Many customers take 400iu year-round as a gentle everyday amount, rather than stopping and starting with the seasons.

Yes, Vitamin D contributes to normal immune function, bones, teeth and muscle function, so a consistent daily amount like 400iu fits easily into a routine. Stick to the label dose, and speak to your GP or pharmacist first if you take other medicines or supplements.

Yes, Vitamin D contributes to the maintenance of normal bones and teeth as part of everyday nutrition (an authorised claim). It works alongside calcium and a balanced diet; it isn't a treatment for any bone condition, so speak to your GP about anything you're concerned about.

Because sunlight is our main natural source, many people simply top up in autumn and winter when levels naturally dip. Vitamin D status can only be confirmed with a test from your GP, we'd always recommend checking with them if you're unsure rather than guessing from symptoms.

Not quite, Vitamin D is the general term, and D3 (cholecalciferol) is the specific form most commonly used in UK supplements, as it's well recognised by the body. This product provides 400iu of Vitamin D3 in an easy daily dose.

Vitamin D contributes to the normal function of muscles, so keeping your levels topped up may help if you notice aching or weakness, especially through the darker months when sunlight is scarce. It works alongside a balanced diet rather than replacing one. If aches are persistent or severe, please speak to your GP or pharmacist so they can check what is going on.

Check the age suitability on the current label, 400iu is a commonly recommended everyday level, but always follow the label guidance for children, and check with your GP or pharmacist if you're ever unsure.

Vitamin D status is measured by a simple test, not by how you feel day to day, so it can be hard to judge from symptoms alone. Your GP can check your levels if you're concerned, and can advise on the right amount for you.

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.