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Signs you may be lacking crucial vitamins: Fatigue or weakness Muscle aches or weakness Mood changes, like depression or irritability Oral health issues, like gum problems or mouth sores Skin problems, such as dryness, rashes, or acne Changes in vision or eye problems Numbness or tingling in hands or feet Memory problems or difficulty concentrating Slow wound healing or easy bruising Digestive issues, such as diarrhea or constipation Hair loss or changes in hair quality Frequent infections or a weakened immune system These symptoms can indicate various vitamin deficiencies or may be caused by other factors entirely

Proc Natl Acad Sci USA 104, 1999520000.CrossRefGoogle ScholarPubMed 12 deficiency and depression in physically disabled older women: epidemiologic evidence from the Womens health and aging study

We have used this electronic data capture system with success in many previous studies

Slow release oral morphine versus methadone for opioid use disorder in the fentanyl era (pRESTO): protocol for a non-inferiority randomized clinical trial