Bests & Worsts Reviews from Amazon

This product has an alarming issue with product consistency. I purchased a bottle a couple of months ago and then again last week. As the attached photo shows, there is a clearly visible, night and day difference between the two lots (darkerr colored pill is from the first purchase). Without any sort of viable explanation or notation present, this concerns me in regard to purity, additives, age and accuracy - and of course, safety - and I believe should be of concern to other potential buyers until an explanation becomes present in the description, on the label, or at the least, to this review.