My injury weakened leg sees no improvement for a year. For that year, I am injecting Lantus insulin only into the "tougher" right thigh. The right leg gets tougher. The left leg shows no improvement. Finally I begin to inject the left thigh with Lantus. That left leg immediately gets stronger. It doesn't feel as shaky any more. What does that tell you about Lantus? And Insulin? I've been using it for a long while and I can't remember any problems at all. Worrying about the pain from the "shot"... Sign in to see full entry.