LifePak Nano contains vitamin A and vitamin D, which can cause side effects such as fatigue and headache if taken too much and too often, according to Nu Skin and WebMD. Some other vitamins in the product that have potential side effects include vitamin C and folate.
Vitamin A has a variety of uses, ranging from improving eyesight to boosting the immune symptom, explains WebMD. However, if taken in large amounts, people may be more at risk of osteoporosis and hip fracture. WIth long-term use, the vitamin can cause fatigue, mental changes, stomach discomfort, vomiting and mild fever.
Vitamin D is used for treating weak bones as well as various skin conditions, notes WebMD. If taken in large amounts for a long period of time, the vitamin can cause excessively high levels of calcium in the blood. Other side effects include weakness, sleepiness, loss of appetite, a metallic taste and vomiting.
People with a history of kidney problems or hematochromatosis, or those who smoke, should consult a doctor before supplementing with vitamin C, states Drugs.com. The vitamin may have unwanted side effects, such as lower back pain and diarrhea, as well an increased risk of kidney stones. Folate, or folic acid, is a B vitamin that helps the body produce cells, but can also lead to side effects such as nausea, bloating, sleep problems and depression.