22/11/2025
Most people take Vitamin D3 in winter without really knowing why. But D3 isn’t a seasonal checkbox - it’s a core signal your body uses for energy, immune strength, muscle function and overall metabolic stability.
When levels drop - which is common in the UK from October to March - you feel it: lower mood, slower recovery, reduced strength output, and that “winter fog” many people assume is normal.
When sunlight drops, you don’t have to let your performance drop with it.