Do you contact the customs office or the carrier first?

Is a baseline blood test really necessary before starting something like this?

What is the first thing you would read if you were starting from zero? Side effects was my main issue with citicoline too.

Is it normal to feel worse before better? Nobody told me that.

Following this because I am in the same place and have no idea what to ask at the appointment. How long have you been on a playlist for concentration?