Lipotropin is interesting.
As for AICAR, at the 2009 TdF AICAR ampules were found in the garbage bins, so we know for a fact that it was being used.
Otoh, here's Saugy downplaying the importance of AICAR and GW1516 in 2013
http://sport24.lefigaro.fr/cyclisme/tour-de-france/actualites/le-dopage-du-futur-sera-genetique-643836Wouldn't bet my life on Saugy telling the truth here though.
Brailsford's opinion:
Paul Kimmage asked Brailsford precisely how Peter Kennaugh had managed - by his own admission - to lose five kilograms since he lined up at the Tour de Romandie in late April.
"Through calorie deficit," Brailsford said bluntly, before then expanding slightly on his answer. "Why not speak to Nigel our nutritionist? It's a good question to ask. That is a lot of weight to lose and I totally agree with you. What do we do to get to that kind of weight loss? They're the types of questions that would be legitimate to answer. I don't think there's any great secret in that."
http://www.cyclingnews.com/news/lessons-have-been-learned-says-brailsford