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.
Symptoms of acute vitamin A toxicity include: drowsiness; irritability; abdominal pain; nausea; vomiting; increased pressure on the brain; Symptoms of chronic vitamin A toxicity include: blurry vision or other vision changes; swelling of the bones; bone pain; poor appetite; dizziness; nausea and vomiting; sensitivity to sunlight; dry, rough skin; itchy or peeling skin