Why is my hair falling out while I take kratom for pain management?

I suffer from chronic pain conditions. My doctor had me on morphine and vicodin scripts for decades. Kratom is natural and works better at relieving my pain. A month after starting kratom, my hair began to fall out. It became brittle and broke off. I tested my thyroid, DHT levels, and hormones, all normal. Four different types of doctors all agree it's the kratom. I take vitamins, moringa, drink lots of water to hydrate. Why is this happening. Many people have reported this happening to them as well.