@Boehm Collector
We are away from home on vacation so I don't know what is in the ingredient listing for either product. I have only used the serum on the horrible nails.....all my life my nails were mid-length and very strong until my late 70's.
If you used the " matte " or dull gold bottle, then you were using a product that also had nail polish in it. That could do a number on your nails. ( This is why I posted the picture of the shiny gold bottle. )
If you're still leery, I suggest you try some of the posters' other recommendations.
We make a living by what we get. We make a life by what we give.
Sir Winston Churchill