Category Nuances for niacin:

• natural,
• essential,
• simple,
• healthy,
• viable,
• active,
• supplemental,
• special,
• ordinary,
• important,
• valuable,
• key,
• additional,
• single,
• vital,

Simple Categories for niacin:

• agent,
• thing,
• nutrient,
• nutrition,
• vitamin,
• substance,
• micronutrient,