Joking apart, I think it's generally accepted that America a much more liberal view about the supply of drugs. Over here, you'll be met with concern because it's possible you could be manufacturing, or altering drugs for resale - either prescription or 'recreational'.
Obviously there has been quite a growth in homeopathic and organic needs for empty capsules... but for a private individual to be making enquiries is going to raise eyebrows in the high street Chemist.