Answers
1, a, Vitamin B12 and Folate are B complex vitamin that is important for making Red blood cells, WBC, repair cells and tissues, synthesis DNA and work in normal nerve cell function.
b, Vitamin B12 and folate generally considered safe. High level of these vitamins provides negative side-effects as it will megadose leads to outbreaks of acne and redness of the skin, loss of kidney function, heart attack, shock and risk of autism disorder.
2, a, the two vitamins synthesized in the human body are niacin and vitamin D. they need the proper functioning of liver and skin.
3, Niacin and vitamin D play an important role in digestive, mental health and skin and support cell metabolism. deficiency impacts the function of the digestive organ that leads to chronic kidney disease and diarrhea.