deficiency of what vitamin causes fatigue
Vitamin B12 Deficiency Symptoms. Fatigue is a major part of B12 deficiency symptoms (that run down feeling). Excessive breathing during normal activity or light exercise (your out of breath)-when you are low on B12 you need more oxygen in your system to run metabolic pathways hence the extra breathing. Heart arrhythmia.
Vitamin D deficiency linked to daytime sleepiness. A new study finds a correlation between the 'sunshine vitamin' and daytime fatigue. Photo: cartoons/Shutterstock. For anyone who has suffered through the achy slog of sleepiness during the day, the dream of a quick pick-me-up is all too familiar.