Amino acids are concentrated in protein-rich foods such as lean red meats, chicken, pork, fish, shellfish, eggs, soybeans, tofu, nuts and dairy products. Plant-Based Protein Sources can be found in beans and legumes, chia seeds and linseed. Grain sources include oats, buckwheat and quinoa and other wholegrains. Vegetables that are rich in amino acids include broccoli, beetroot, pumpkin, cabbage, peas, carrots, cucumbers, green leafy vegetables and onions. Fruits include apples, bananas, berries, figs, grapes, melons, oranges, papayas, pineapples and pomegranates.