Gastro-intestinal release capsule intended for oral use in a method for desensitizing and/or inducing tolerance in a peanut-allergic subject or, alternatively, for diagnosing a peanut allergy in a subject. The capsule has a shell and a core, the core has a composition of peanut including peanut, at least one oil, at least one first pulverulent excipient and, optionally, at least one second prebiotic excipient. The capsule is provided and ingested in an unopened form.