4-DHEA Precursor?

I had a quick question regarding the validity of these so called 4-DHEA precursors. I found them at one of my local supp stores. The labels look intriguing and I am wondering if the manufacturers are just changing the makeup to get around the ban. Has anybody used them? Reviews? Experiences? And what exactly is it?

I included a couple pics for examples. Any input would be appreciated. Thanks!

JUST TO BE CLEAR I AM NOT LOOKING FOR SOURCES ASKING ABOUT SOURCES OR CARE ABOUT LEGIT SOURCES. I AM CURIOUS ABOUT THE CHEMICAL COMPOUND ITSELF. THE PICS ARE AN EXAMPLE.

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