Signs of vitamin D3 overdose include bone fractures, heart complications and kidney dysfunction, as SFGate reports. Generally, excessive vitamin D in the body results in fatigue, dizziness, nausea, vomiting and weight lo... More »

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Safe dosages of vitamin D3 vary from 1,000 IU to 10,000 IU daily according to the need of the patient, notes Vitamin Research Products. People should have their physicians test their vitamin D3 levels to determine the pr... More »

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The average dose of vitamin D-3 in most supplements is 400 international units, states WebMD. If a person takes over 4,000 international units of vitamin D-3 a day, there is potential for negative side effects, states Co... More »

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Signs of vitamin D3 deficiency include bone pain and muscle weakness, according to MedicineNet. However, mild vitamin D deficiency does not always cause symptoms. Severe deficiency of vitamin D can lead to rickets, a con... More »

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Egg yolks, beef liver, cheese and fatty fish are the best food sources for natural vitamin D3, according to SFGate. Cod liver oil is also an excellent source of vitamin D3, and fortified milk and orange juice may contain... More »

Taking too much vitamin D3 can cause calcium levels to reach dangerous levels, and taking a calcium supplement on top of vitamin D3 puts the patient at further risk, states WebMD. Too much calcium in the body leads to na... More »

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Vitamin D2 and vitamin D3 are the forms of vitamin D most important to human health, according to the Mayo Clinic. Vitamin D2 is manufactured by plants, while vitamin D3 is manufactured in the skin when it's exposed to t... More »

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