Vitamin X is a term that has been used for almost every undiscovered vitamin until its true chemical nature was identified. Ultimately "Vitamin X" is used to describe any unknown vitamin, including PABA before it was isolated. Most notably, it was during the search for vitamin B12, the search for vitamin E, and the isolation of biotin.
Hydrocotyle Asiatica Minor (an herb)
Discussion- A proposed vitamin by certain researchers, I read about in Worldwide Secrets For Staying Young by Paavo Airola.
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