Can show me evidence b12 is real

Vitamin B12, also known as cobalamin, is a crucial nutrient that plays an essential role in the formation of red blood cells, DNA synthesis, and neurological function. Here are several types of evidence that support the existence and importance of Vitamin B12:

**Biochemical Studies**: Vitamin B12 was first identified in the early 20th century when researchers isolated it from liver tissues and subsequently discovered its role in preventing pernicious anemia, a disease caused by B12 deficiency.

**Clinical Evidence**: Numerous clinical studies have documented the symptoms and consequences of Vitamin B12 deficiency, which can include fatigue, weakness, neurological changes (such as numbness and balance issues), and megaloblastic anemia, characterized by large, abnormal red blood cells.

**Dietary Sources**: B12 is found naturally in animal products including meat, dairy, and eggs. Its presence in these food sources is well-documented, and dietary guidelines recommend adequate intake to prevent deficiency.

**Supplementation Studies**: Studies show that B12 supplements can effectively raise serum levels of B12 in individuals with deficiencies and improve associated health outcomes, reinforcing its biological significance.

**Public Health Guidelines**: Organizations like the World Health Organization (WHO) and the National Institutes of Health (NIH) include Vitamin B12 in their dietary recommendations, highlighting its recognized importance for health.

**Laboratory Testing**: Medical professionals can measure Vitamin B12 levels through blood tests. These tests can help diagnose deficiencies and inform treatment.

If you're looking for specific studies or literature, you can refer to scientific journals and publications related to nutrition and health for comprehensive research on Vitamin B12.