My attitude is the reverse. You want to risk your life climbing without ropes? Knock yourself out–but don’t expect any support from me. ... But, you want to risk your life trying an unapproved medical treatment? Sir, I salute you. Give that man a Nobel prize."
That's from here.
The background to this is that foecal transplants are highly regulated in the US. They could of course lead to infection. As the writer puts it, "No doubt–this is why we also ban sex and french kissing."
Which prompts in me this thought: would the authorities be more likely to bend to pressure from adults who wanted to carry out these procedures if they were sexually motivated rather than prompted by an interest in curing diseases? And, for adults at least, isn't this a question of "My Body, My Choice"?