Excess of vitamin intake or vitamin overdose is called hypervitaminosis. It is a condition of high storage levels of vitamin, which can lead to toxicity.
Hypervitaminosis A is an excess of vitamin A, Similarly Hypervitaminosis C an excess of vitamin C, and so on.
High or toxic levels of vitamins occur when you have high supplement intake and when you do not take from dietary sources.
Fougera vitamin A and D ointment can be used on a cat's skin to treat sores. There is no known danger or health risk associated with external use.
Calamansi is very rich in Vitamin C. It also has a lightening ingredient. You can use it as a deodorant :)
Vitamin D is the vitamin that your body can store because it can be synthesized and stored in fat cells for later use. Vitamin C, on the other hand, is not stored in the body and any excess is excreted through urine.
Only synthetic vitamins can be harmful if taken in excess. Natural (food-based) vitamins will be flushed out easily by the body if not needed. They are much more easily absorbed, and you are thus more likely to experience health improvements with natural vitamins.
No more so than the use of a cell phone.
"Vitamin C: The Antioxidant Superhero" "Citrus Showdown: Investigating the Vitamin C Content in Different Fruits" "The Power of Vitamin C: A Study on its Effects on Immune Health" "From Oranges to Supplements: Analyzing the Best Sources of Vitamin C"
Vitamin B is a water soluble vitamin meaning that it is not stored in the body. Your body will use what it needs and flush the remainder out in the urine. Water soluble vitamins need to be replaced on a regular basis. As with any vitamin you should always follow the manufacturers recommended daily dosage. By doing this you will not run into problems. However, Vitamin D being fat soluble, means that it does not get flushed by the kidneys if consumed in excess, and stored within the liver predominantly.
Vitamin A.
Vitamin A
Vitamin toxicity can be prevented by minimizing the use of vitamin supplements.
Generally speaking the health of your eyes reflect the health of the rest of you. The lack of vitamin A will damage eyes. It is said you are more likely to use glasses if you read a lot, or even watch tv or use a computer a lot.
Vitamin D is essential for strong bones, because it helps the body use calcium from the diet. Traditionally, vitamin D deficiency has been associated with rickets, a disease in which the bone tissue doesn't properly mineralize, leading to soft bones and skeletal deformities. But increasingly, research is revealing the importance of vitamin D in protecting against a host of health problems.Symptoms and Health Risks of Vitamin D DeficiencySymptoms of bone pain and muscle weakness can mean you have a vitamin D deficiency. However, for many people, the symptoms are subtle. Yet, even without symptoms, too little vitamin D can pose health risks. Low blood levels of the vitamin have been associated with the following:Increased risk of death from cardiovascular diseaseCognitive impairment in older adultsSevere Asthma in childrenCancer