Possible Clues:

• B3 or B12, for example
• Contents of mini-vat could supply health supplement
• Energy drinks tasting awful initially in organic compound
• A, B, C, D, E, or K, as a tablet
• Thiamine. for instance
• Riboflavin, for example
• Very with it, former dictator offering health supplement?
• Substance essential in small quantities for normal metabolism
• Dietary supplement
• A, B or C, but not X, Y or Z