How many standard amino acids are classified as ‘essential’ for humans? 👤 By TheQuizWire ✅ Fact Checked 📊 Difficulty Medium 📅 Last Updated 01 Dec 2025 A. Six B. Nine C. Three D. Twelve Check Answer 💡 Explanation: Nine of the 20 standard amino acids are essential, meaning the human body cannot synthesize them and they must be obtained from food. 📚 Topics: Food and Cuisine Nutrition 🎯 Exams: CSS GEN NTS PMS