You said to not recommend a "product" - however, I've seen
testimonials about castor oil application removing stretch marks. CO is
cheap, and you can find it lots of places. Be aware though, it is tougher
than the dickens to get it off of your skin and almost impossible to remove from
clothing, etc. A CO pack may help too.
Ingesting my urine has remove "pre" cancers (before and after has
been dermatologist verified). It took almost a year of daily
ingestion. This was after topical application of urine did nothing for
them.