As the sun shines brightly over Bedford and the days stretch long into the evening, it’s a time of year when many of us are out and about, soaking up the warmth and enjoying the outdoors. It’s also a time when our bodies are naturally exposed to sunlight — a key source of vitamin D3. Vitamin D3 is a nutrient that contributes to the normal function of the immune system and to the maintenance of normal bones, teeth and muscle function, and it’s something we can get through our diet, our lifestyle choices and, where needed, a supplement. Here’s a plain look at what it is, how to choose, and what’s worth asking us about in the shop.
What the research says
Research into vitamin D3 and how it works in the body is ongoing, and not all of it is directly relevant to the supplements on our shelves. A 2025 study on White Pekin ducks, for example, looked at how different vitamin D3 intakes affected the birds’ growth and general condition. Animal studies like this one can’t tell us what a supplement will do for a person, but they form part of the wider scientific background to how vitamin D works in the body.
Another study, from 2026, examined how vitamin D3 behaves in the nervous tissue of rabbits. Again, findings in animals don’t translate directly to people, and researchers are still working out what results like these might mean. What we can say with confidence is much simpler: vitamin D contributes to the normal function of the immune system and to the maintenance of normal bones. If you’re thinking about topping up over the summer, vitamin D3 supplements come in a range of strengths to suit different needs.
It’s also worth knowing that UK sunlight is too weak for our skin to make vitamin D between October and March, which is why official guidance suggests everyone consider a daily supplement during those months. In summer, most of us make enough through time outdoors, though people who cover their skin, work indoors or rarely get outside may not. If that sounds like you, it’s a sensible moment to think about your vitamin D intake from food — oily fish, eggs and fortified spreads all count — and whether a supplement might be worth discussing with a professional.
How to choose
If you’re considering supplementing with vitamin D3, it’s important to choose a product that suits your needs. There are a range of options available, from capsules to oral sprays, and each suits a different preference. Vitamin D3 oral sprays, for example, are a convenient option for those who prefer not to swallow capsules — a few sprays and you’re done.
When choosing a supplement, it’s also worth considering the strength. People who get very little sun exposure, and those whose GP has told them their levels are low, may be pointed towards a higher dose. Products like Bio-Vitamin D3 D-Pearls 5000 IU offer a higher strength, while others, such as Bio-Vitamin D3 D-Pearls 1000 IU, suit those looking for a more moderate daily amount. Whatever you choose, always stick to the dose stated on the label.
It’s also worth considering combinations. Some products, like Magnesium & Vitamin D3 Capsules, combine vitamin D3 with magnesium. Vitamin D contributes to the maintenance of normal bones, while magnesium contributes to the maintenance of normal bones and normal muscle function — so a combination can be a tidy option if you’d rather take one capsule than two.
If you’re unsure about which product to choose, or if you’re taking any medication, it’s always a good idea to speak to your GP or pharmacist before starting any new supplement. And if you’re pregnant or planning to become pregnant, do speak to your GP or pharmacist first too — they can help you find the right approach for your individual needs.
At Pumpernickel, we’re here to help you find the right products for your health and wellbeing. Come in and speak to one of our knowledgeable staff members, who can guide you through our range and help you choose the best option for you. We’re located at 7 The Arcade, Bedford, MK40 1NS, and we’re open Monday to Saturday from 9:30 am to 5:15 pm. You can also give us a call on 01234 348179 if you have any questions or need further assistance. We look forward to seeing you in the shop soon.