Cod liver oil and calcium tablets can be taken together, because the role of cod liver oil is to use the vitamin D contained in it to promote the absorption of calcium, and after taking it together with calcium tablets can make the calcium absorbed more, and the calcium deposited in the bones will not be excreted easily. So for the treatment of osteoporosis in the past is the best partner, but now cod liver oil plus calcium tablets treatment mode has changed, the reason is that cod liver oil contains vitamin D in addition to vitamin A, after eating too much, these two fat-soluble vitamins are prone to poisoning, especially vitamin A poisoning will cause abdominal pain, diarrhea and other adverse reactions, so now generally no longer eat cod liver oil, but directly eat Vitamin D3, or active vitamin D3, so as not to cause vitamin A poisoning.