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.
Sources of calcium. Calcium needs to be obtained from the diet as it is not manufactured by the body. The main sources of calcium in the diet are milk, dairy products and other calcium-rich foods such as fish with edible bones (e.g sardines and anchovies), beans, tofu, spinach, watercress and broccoli.