What kind of calcium supplements men take for calcium deficiency is usually related to their health condition, age, etc. and cannot be generalized. Since the calcium in each calcium supplement combines with different acid roots to form compounds with different calcium content, men with calcium deficiency need to choose a calcium supplement that suits them. For those who are not deficient in stomach acid, it is recommended to choose inorganic calcium, while those who are deficient in stomach acid are recommended to choose organic acid calcium or chelated calcium, which does not require stomach acid to participate in the action. For the elderly, a combination of vitamin D and calcium carbonate with relatively high bioavailability and easy absorption is recommended due to low absorption. For those with more serious calcium deficiency, calcium carbonate, calcium acetate or calcium citrate with higher calcium content and absorption rate are recommended. For the general population, it is recommended to ensure that daily sun exposure is an affordable method of calcium supplementation. Therefore, it is recommended to take calcium supplements under the guidance of a medical professional and do not abuse them without authorization.