Which vitamin deficiency can lead to skin, nerve, and mental problems?

Vitamin B3, also known as niacin, is essential for numerous bodily functions, particularly in energy metabolism and the synthesis of certain hormones. A deficiency in Vitamin B3 can lead to a condition known as pellagra, which is characterized by three primary symptoms: dermatitis (skin issues), diarrhea, and dementia (nerve and mental problems).

Skin issues arise because niacin plays a crucial role in maintaining healthy skin by supporting the integrity of skin cells. The nerve problems can manifest as confusion, memory loss, and mood changes, pointing to its role in the nervous system's health. Mental health issues associated with B3 deficiency include cognitive decline and symptoms resembling depression. This multifaceted impact on skin, nerves, and mental faculties clearly illustrates why a deficiency in Vitamin B3 can lead to such serious health concerns.

The other vitamins listed are important for various functions as well, but they do not fit the specific combination of symptoms associated with B3 deficiency. For instance, Vitamin B1 (thiamine) is crucial for energy production and nerve function, yet its deficiency leads primarily to neurological problems such as Wernicke-Korsakoff syndrome rather than skin issues. Similarly, Vitamin C is essential for collagen synthesis and immune function, and its deficiency primarily