Per VetOne's website each mL of liquid contains: Cyanocobalamin (Vitamin B-12) 1000mcg, sodium chloride, ammonium sulfate, citric acid, sodium citrate, and benzyl alcohol (preservative)
The National Institutes of Health recommends 1.6 grams daily for males ages 19-50 and 1.1 grams for females in the same age group
32 List of medicines currently in PRIME scheme. European Medicines Agency
Zhang C, Hu J, Wang W, Sun Y, Sun K
Tendons in particular are slow to heal, as Cleveland Clinic notes in its overview of why injured tendons recover slowly, which is part of why chronic tendinopathy is a common reason patients ask about regenerative peptides
Proceedings of the National Academy of Sciences of the United States of America, 120 (15)