He seems like a sound bloke and a strong racer but nothing would particularly surprise me at the moment. From a review of his book:
Originally Posted by Creakyknees
Given the era he rode in, Peiper was at the sharp end of doping, a subject he is non-judgemental about. He frequently offers the excuse that the problem is two-fold: first, drugs have always been part of the sport; second, there is so much pressure on riders that it's inevitable that they dope. Of his own experience with doping he says "I tried to ride clean, most of the time."
Of the times that he didn't ride clean he talks of dosing up on amphetamines a couple of times, in Chaudieres, races where there were no controls. Mostly he avoided amphetamines though, fearing addiction. He talks of being given testosterone by a Peugeot team doctor: "I think that dose made me so strong that my own muscles actually tore the tendon [in my knee]." Curiously he never mentions cortisone. He does talk of a Dr Janssen - presumably Eugène Janssen, of the PDM Intralipid affair - who worked with Panasonic and believed in hormone rebalancing, which Peiper seems to think is fair dinkum.