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Four weeks of combination exercise training improved executive functions, episodic memory, and processing speed in healthy elderly people: evidence from a randomized controlled trial

Red blood cell deficiencies can lead to anemia, which causes fatigue, general weakness, headaches, and dizziness

They are commonly prescribed for people with pernicious anaemia, malabsorption conditions, certain digestive disorders, or those who cannot maintain healthy levels through diet or oral supplements alone

For B vitamins, IV delivery also bypasses gut absorption, but clinical benefit still depends on deficiency status, dose, and the reason for treatment