What is b12 ocean 500?

As an AI language model, I don't have access to current, contextual information and therefore, can't provide a definitive answer that correctly reflects the nature of your question.

However, here is some generic information about b12 and ocean 500:

B12: Vitamin B12 is a water-soluble vitamin that plays a vital role in the proper functioning of the brain and nervous system and the formation of red blood cells. It is essential for energy metabolism, DNA synthesis, and the regulation of homocysteine levels in the blood. Vitamin B12 is found primarily in animal-based foods such as meat, fish, and dairy products. Deficiency of B12 can cause anemia, fatigue, and neurological problems.

Ocean 500: It's uncertain what you're referring to here, but one possible interpretation is that you're referring to a product or brand named 'Ocean 500'. If that's the case, then there is no information available to indicate what this product/brand is or what it offers.