It appears as a white lyophilized powder
For most people, the effects last about one to two weeks, though the exact timeline shifts based on your current B12 levels, metabolism, diet, and how often you get injections

Some notable safety-related conclusions from scientific materials include: A 2016 review of TB4 for dermal healing: The safety profile is excellent, and no preclinical toxicology has been found.22 A 2016 clinical trial on patients with STEMI: Our pilot study suggested that T4-optimized EPC transplantation appeared to be feasible and safe.34 A 2021 review of TB4 research: It was well tolerated and safe in healthy people and suitable for use in a clinical study.21 Though the compound itself may be generally safe for adults to use, some common side effects from TB4 injections reported by patients and doctors include: Injection site reactions (e.g., redness, mild swelling, or pain) Mild gastrointestinal symptoms Headaches and dizziness Rare but more serious side effects can include fever, blistering at the injection site, muscle aches, skin rash, vomiting, severe itching, or hives

BPC-157 has been found to counteract side effects of NSAIDs, medications used in psychiatric conditions, and a number of heart medications
Its commonly found in animal products like meat, eggs, and dairy, which means individuals following plant-based diets or with certain medical conditions may have a higher risk of deficiency