nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqxd3kd9vvvudk2qzcnqjr9w0x878vf9qwju3mwu3w2m40tasz986q2u5gjj  where to they get the FenBen?? And how do you find how much to take?