You can also add these research favorites below.
Pros: Naturally occurring in the body, giving it a favorable long-term safety profile compared to many synthetic peptides Backed by decades of published research on collagen synthesis, wound healing, and antioxidant activity Available in both topical (cosmetic-legal) and injectable forms depending on desired intensity Cons: Injectable/research-grade product is not standardized or quality-controlled the way pharmaceuticals are, so purity varies significantly by vendor High topical concentrations can cause skin irritation, and there is limited long-term human trial data for injectable use Side Effects: Topical use is generally well tolerated, with occasional mild redness, tingling, or dryness at the application site
Together, they address both sides of the problem
For laboratory research use, the safest sources are US-based suppliers that publish independent, batch-specific Certificates of Analysis and ship domestically to protect temperature-sensitive material
Results Clinical examinations Tail motor function score As expected, the tail motor function scores demonstrated persistent debilitation in the rats that underwent spinal cord injury and received saline postinjury