b12 and vitamin c injection at a Licensed Pharmacy but a deficiency may occur in certain health conditions (e.g. Mecolus‑C Combo – Vitamin C – Vitamins Injections - Vitamins A,

They call it an unapproved drug for this use

This critical difference means it functions as a targeted lipolytic agent rather than a systemic hormone, allowing for fat metabolism enhancement without the appetite disruptions, cortisol elevation, or blood sugar effects associated with growth hormone therapy

"2013 AHA/ACC/TOS guideline for the management of overweight and obesity in adults: A report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines and The Obesity Society (in Eng)

Any DIY AHK-Cu solution intended for more than a few days of use absolutely requires a preservative