The purpose of the current exploratory clinical trial is to determine the effect of oral
ingestion of metformin (OIM) in non-diabetic patients with chronic Achilles tendon pain. The
trial has two aims; 1) to assess the effects of OIM treatment on tendon pain, and 2) to
determine the effects of OIM capsules on tendon healing and repair. Twenty participants will
be treated with metformin capsules for 16 weeks combined with a home exercise program. A
comparison group of 20 participants will be treated with placebo tablets along with home
exercise program.