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.
Here is a list of vegetarian-friendly sources of calcium: 1  Low-fat or fat-free milk, yogurt and cheese. 2  Fortified plant-based milks such as soy or almond. 3  Fortified ready-to-eat cereals. 4  Calcium-fortified juice. 5  Calcium-set tofu. 6  Some leafy green vegetables including collard greens, turnip greens and kale. 7  Broccoli.