Opioids are substances that act on opioid receptors to produce morphine-like effects. Medically they are primarily used for pain relief, including anesthesia. Other medical uses include suppression of diarrhea, treating addiction, reversing opioid overdose, suppressing cough, and suppressing opioid induced constipation.
Other foods that are high in calcium include: 1  Spinach. 2  Kale. 3  Okra. Collards. 4  Soybeans. White beans.  Some fish, like sardines, salmon, perch, and rainbow 1  trout. Foods that are calcium-fortified, such as some orange juice, oatmeal, and breakfast  cereal.
1 Milk, yogurt, and cheese are the main food sources of calcium for the majority of people in the United States. 2  Kale, broccoli, and Chinese cabbage are fine vegetable sources of calcium. 3  Fish with soft bones that you eat, such as canned sardines and salmon, are fine animal sources of calcium.