Common adverse effects include bluish-green discoloration of urine (and feces).

The provided text states that Redox Blue products have "No additives, fillers, or synthetic ingredients," but it does not specify the full composition. Therefore, I don't have enough information to confirm the presence or absence of B vitamins.

This information is not provided in the context.

Redox Blue can be purchased on their website. They offer free domestic shipping within the United States for orders over $74.95.  They do not ship internationally.

This document does not specify how many types of methylene blue exist. It primarily discusses methylene blue as a single compound (methylthioninium chloride) used in various applications.  It does mention different formulations (e.g., intravenous, oral), and the "Redox Blue" brand sells it in tablet form, but these are delivery methods, not different types of the compound itself.

German chemist Heinrich Caro in 1876.

Methylene Blue was first prepared in 1876 by German chemist Heinrich Caro.

This information is not provided in the documents.

The therapeutic dose of methylene blue is typically less than 2 mg/kg. Doses greater than 7 mg/kg increase adverse effects.

Methylene Blue (Methylthioninium chloride) is a synthetic dye first prepared in 1876. It appears as a dark green powder that produces a blue solution in water.  It's used as a redox indicator, turning blue in an oxidizing environment and colorless in a reducing environment.  It has a maximum light absorption near 670 nm and acts as a photosensitizer.  It has various medical and diagnostic applications, including FDA-approved treatment for methemoglobinemia. It's also used in various other applications, such as a milk freshness test, in aquaculture, sulfide analysis, water testing, and biological staining.  "Redox Blue" is a brand that markets Methylene Blue supplements.