Name two vitamins produced by bacterial fermentation

Explanation

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for two vitamins that are produced by bacterial fermentation.

2. **First Vitamin**: The first vitamin produced by bacterial fermentation is Vitamin B12. It is also known as cobalamin.

3. **Production of Vitamin B12**: Vitamin B12 is produced as a by-product during the fermentation processes of certain antibiotics, such as streptomycin and aureomycin. Additionally, it can be produced on a larger scale through microbial fermentation using specific bacterial species.

...