UNITED KINGDOM / AGILITYPR.NEWS / November 04, 2025 / Supp, the Sheffield-based supplement brand on a mission to make evidence-based nutrition simple and effective, is helping the nation stay strong through the darker months this winter with its goodness-packed Vitamin D3 + K2 capsules, delivering sunshine through the letterbox when the skies turn grey.

With the clocks turned back and sunlight growing scarce, maintaining healthy Vitamin D levels becomes more important than ever. This powerhouse nutrient supports a remarkable range of functions in the body: it helps maintain strong bones and teeth, supports muscle and immune function, and even plays a role in keeping brain cells healthy. Yet, from October to March, the UK simply doesn’t get enough sunlight for the human body to produce adequate supplies of Vitamin D on its own.

The result? According to national data, one in six adults in Britain has low Vitamin D levels. It’s a deficiency that can leave the body feeling tired, achy, and run down just when it needs energy and resilience most.

Supp co-founder and biomedical scientist Olivia Buckley explains: “Vitamin D is one of the few nutrients the NHS recommends everyone in the UK supplement during autumn and winter. It’s essential for bone and muscle health, but its influence on mood and immunity is equally important. Our formula pairs Vitamin D3 with Vitamin K2, which helps guide calcium into bones and teeth where it belongs, and keeps it away from arteries and soft tissues.”

Designed for optimal absorption and convenience, Supp’s Vitamin D3 + K2 capsules deliver a balanced daily dose of both nutrients. Manufactured in the UK to GMP standards, the product reflects Supp’s commitment to clean, transparent, and research-backed formulations.

Co-founder Toby Devonshire adds: “We call it ‘sunshine through your letterbox’ because Supp letterbox supplements offer an easy, reliable way to look after their health when daylight disappears. Our goal has always been to take the confusion out of supplementation and give people products that work, with information they can trust.”

As natural sunlight takes a seasonal break, Supp’s Vitamin D3 + K2 offers a simple daily ritual to help everyone feel brighter, stronger, and ready for the winter ahead.

For more information, visit https://supp.store.