I am 44 yrs old and I have started to use Retin A Gel 0.01 every night. Before using the Retin A, I read many websites on Tretinoin and overall most of them were very positive. However, today I stumbled across this link http://truthinaging.com/ingredient-spotlight/tretinoin-and-retinoids-toxicity-and-safety Please can you give me your professional opinion as I feel somewhat disheartened about Retin A.