dihexa clinical trial has real research behind it. It also has zero human trials. Both are true at once, and that tension is the whole story. Online it gets talked about like a Dihexa UK: Evidence-Based Peptide Research

Maintenance Dosing Guidelines After the initial treatment, patients need maintenance dosing to keep vitamin B12 levels up

Diagnosed Deficiency or Malabsorption if you have a confirmed deficiency in a vitamin that affects appetite (like B1, zinc, or iron) or a condition that impairs nutrient absorption (such as certain digestive disorders or post-surgical states), vitamin injections can be highly beneficial

[DOI] [PubMed] [Google Scholar] 793

But deep down, you want your body to heal not just mask the pain

CPT 96374, by contrast, covers intravenous (IV) push administration where the substance is delivered directly into a vein, typically by a syringe, and the administering provider must be present during the entire infusion

The controlled injury itself triggers wound healing responses