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Concerns. Having high blood calcium levels and taking multiple calcium or vitamin D supplements can result in hypercalcemia over time. High calcium levels can interfere with muscle contractions, hormone levels and brain functioning.Consult with your physician if you think you have taken too much calcium.alcium tablets can cause headaches if taken in excess. Photo Credit Thinkstock/Comstock/Getty Images. Even though vitamins are important to your health, multivitamins and vitamin supplements can cause side effects. Some supplements cause side effects in normal doses, and others cause side effects in excessive doses.
Even though vitamin a is able to increase testerone level naturally, you donât want to consume too much Vitamin A. Very high doses of Vitamin A , i.e. 300,000 IU plus, can cause acute toxicity symptoms such as nausea, vomiting and a splitting headache.