Possible Clues:

• Natural substance essential to health
• Thiamin or niacin
• A, B or C, e.g.
• A, B, C, D, E or K
• Niacin, for one
• Supplement? A possibly very appealing quality in the morning at home
• Accessory food factor
• Essential nutrient, perhaps one cultivated mostly in French wine
• Daily supplement
• A, C or E