Some clinicians cycle phentermine: 12 weeks on, 4 weeks off, repeated as needed
Comparison of vitamin E and propionyl-L-carnitine, separately or in combination, in patients with early chronic Peyronies disease: a double-blind, placebo controlled, randomized study
Cycling advantages include reduced annual costs through intermittent purchasing (30-40% savings vs continuous use), potentially improved responsiveness when restarting after breaks avoiding adaptation, psychological freedom from continuous dependency, and accommodation of life changes, travel, or budget fluctuations
Institute for Health Metrics and Evaluation (IHME)
Periodic monitoring of copper and zinc levels is reasonable for extended use protocols, as the copper-zinc balance can shift with prolonged copper supplementation through any delivery mechanism