Is it possible by the condition of the skin of a person to determine what vitamin he lacks?

If vitamin A is not enough, the skin becomes dry, crackes, darkens, baldness often occurs. A deficiency of vitamin B2 can lead to cracks in the corners of the mouth, to brittle nails, to eczema, and a deficiency of vitamin C to subcutaneous hemorrhages.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.