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.
However, some of the other side effects associated with these vitamins may be more serious, such as: 1  Vitamin B1 (Thiamine): Agitation, insomnia, irritation, high blood pressure and heart palpitations. 2  Vitamin B2 (Riboflavin): Anemia, nausea, fatigue, low blood pressure and vomiting.