Category Nuances for niacin:

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

Simple Categories for niacin:

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