File early. The window is shorter than people think and it starts at the transaction.

Test one thing at a time. It feels slower and it is the only way to learn anything. Vivid dreams was my main issue with piracetam too.

Log dose, time and sleep. Ten seconds a day and it turns the anecdote into something you can look at.

Is a baseline blood test really necessary before starting something like this? How long have you been on selenium?

Written confirmation email after every phone call. Cheapest insurance there is.