I don't know about the specific injections she was talking about, but she was generally speaking about Collagen Peptides. You can buy the powder form on Amazon. I take this one -
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.amazon.com/Collagen-Peptides-Grass-Fed-Certified-Friendly/dp/B00XQ2XGAA&ved=2ahUKEwiYqe6ym93tAhUDnZ4KHZR2AesQFjAAegQIDRAB&usg=AOvVaw1qL7u7I0lZuOel_6zIlNmg