It doesn’t matter how weak it is. People microdose finasteride and still get side effects. A drop of any DHT or estrogen inhibitor can ruin you.
People can claim whatever they want but there’s no way of telling the damage these drugs can do to your body. Depression drugs can give you PFS and they’re not DHT inhibitors but I’d guess they affect those receptors too, and estrogen blockers probably damage the 5AR receptors.