FitLine® for Vitality & Well-being

Half past two in the afternoon, the second coffee is gone — and your head still feels like cotton wool. Tiredness has a thousand causes: too little sleep, too much screen time, too little daylight, too many open tabs in your head. And sometimes it has a cause that comes down to nutrition. That is exactly why it pays to know the basics before you start guessing in the supplement aisle. Three examples from our guide. Vitamin D is mostly made in the skin — but only when the sun is high enough. In winter it sits too low and the body's own production slows down — in Germany, a sizeable share of the population then falls below the desirable blood levels; the regular surveys of the Robert Koch Institute show as much. Iron sits in the red blood pigment that carries oxygen through your body — no wonder it is often the first thing people think of when tiredness strikes. One thing matters here: iron is one of several levers, not a fix-all glue. And the B vitamins are the family that does most of the work in energy metabolism — with diffuse tiredness it is worth looking at B2, B3, B6 and B12; all four are officially listed for the reduction of tiredness and fatigue (EFSA). What you will not find in the articles below: quick diagnoses and big promises. Whether there is more behind persistent tiredness is something to clarify with your doctor — a blood test says more than any online quiz. What you will find instead: clear explanations, concrete food examples and the reference values of the scientific societies, so you can place where you stand. Start where your everyday life pinches most: with the winter article when the dark months are coming; with the iron article if tiredness is your constant companion; with the B-vitamin overview if you want to sort out the bigger picture. Each article stands on its own, names its sources — and says honestly what research knows and what it does not. Step by step, you build a picture of what your daily life asks of your body and where the levers are — no hocus-pocus required.