Tricomin was actually proven to work. It is the substance they used in the copper peptide study (except the amount of copper peptides was much higher in the test).
Folligen is apparently WAYYY stronger than Tricomin as far as the amount of copper peptides is involved. However, many claim it irritates and stains their scalp, so they either dillute it or use something else. I also hear that it smells pretty bad.
I would stick with Tricomin. It's expensive, yes, but I think it does what it is supposed to.
folligen is a random mix of copper peptides of varying lengths. It probably also has some copper sulphate in it. The copper sulphate is corrosive and bad, but dilute. Most of the copper peptides do nothing. Others are, well, random in their effects. Probably a decent number also do what we want them to do. Hopefully the dosing is right. Too much can actually damage your skin, instead of build it up.