in order for your body to absorb calcium, you do require vitamin d. keep in mind that vitamin d is a fat soluble vitamin. taking a multi.vitamin and an additional calcium/vitamin d supplement (like viactiv chews) are always a good idea. aim for appx. 1200-1500mg of calcium and at least 400 i.u.'s of vitamin d/day.
all dairy products...low-fat...are good sources of both. soy products and legumes are also a source of calcium.
sesame seeds are not a significant source of calcium..11mg in 1 tbsp. baked salmon=26mg in 3ounces. an orange has about 50mg of calcium in it.
get a bowes and church book to learn the nutrition content of foods.