Testing at five to six days. It is possible that instead of removing and testing one or two cells from a two â three day old embryo, some centres may allow the embryo to develop to five - six days, when there are 100-150 cells.
Long-term use of large amounts of vitamin A might cause serious side effects including fatigue, irritability, mental changes, anorexia, stomach discomfort, nausea, vomiting, mild fever, excessive sweating, and many other side effects.
Some research shows that taking high doses of vitamin A supplements might increase the chance of death from all causes and possibly other serious side effects. Vitamin A is LIKELY SAFE for children when taken in the recommended amounts.