IPA: /njuːtrəˈsjuːtɪkəl/
KK: /ˈnjuːtrəˌsjuːtɪkəl/
A type of food or supplement that is believed to improve health and provide additional benefits beyond basic nutrition.
Many people take nutraceuticals to support their immune system.
Nutraceutical is formed from "nutrient" (from Latin "nutrire", meaning to nourish) and "pharmaceutical" (from Greek "pharmakon", meaning drug or medicine). The word refers to a substance that is a food or a part of food that provides medical or health benefits, including the prevention and treatment of disease.
Think of 'nourishing' ('nutrient') substances that also act like 'medicines' ('pharmaceutical') — that's what nutraceuticals are.
No commonly confused words.