If you've tried everything for SIBO without success, then you may need to focus here
Intramuscular vs Subcutaneous Parenteral administration of vitamin B-12 via injection has been standard protocol for decades, according to the Centers for Disease Control and Prevention
That said, some people have trouble absorbing vitamin B12 from food and oral supplements and may need it in injectable form
Beyond that landmark study, the evidence base includes research showing GHK-Cu enlarges hair follicle size, extends the anagen (active growth) phase, stimulates dermal papilla cells (the cells that control follicle activity), promotes angiogenesis (blood vessel growth) to the scalp, and reduces the DHT-related inflammation that causes follicle miniaturization in androgenetic alopecia
In animal models, intranasal administration of GHK-Cu improved cognitive functions, reduced amyloid plaques, and decreased inflammation in the brain, suggesting its potential as a therapeutic agent for Alzheimers disease and age-related cognitive decline 10