Historically, little was known about how these drugs might affect male fertility or sexual function
J Clin Invest (2013) 123(6):27306
Reusing syringes is a cardinal sin in peptide research

You should seek medical advice promptly if you: Are currently prescribed testosterone and are considering joining a retatrutide clinical trial Have noticed symptoms of hormonal imbalance such as fatigue, mood changes, reduced libido, or unexpected weight changes while on either treatment Have a history of polycythaemia, liver disease, prostate conditions, or cardiovascular disease, as these may affect suitability for either treatment Are sourcing retatrutide from unregulated online suppliers, which carries serious risks of counterfeit or contaminated products Seek urgent medical attention call 999 or use NHS 111 if you experience: Chest pain, palpitations, or breathlessness Severe, persistent upper abdominal pain (particularly if it radiates to the back), vomiting, or jaundice, which may indicate pancreatitis or gallbladder disease For those already on testosterone therapy through the NHS or a regulated private provider, it is important to inform your prescribing clinician of any new treatments including investigational drugs so that monitoring plans can be adjusted accordingly

Figure 2 presents the most notable and highly ranked potential M pro sites identified computationally (the order A-G is not significant, as placement in the listing was determined by similarity to the known nsp sites)
[PubMed ID: 35031999]