Dear Sir or Madam,
I am from China. I can find quality manufacturer for you, with competitive price.
I would suggest using dark amber or other color, not black, unless your nutritional supplement need to keep in dark place. Basically the bottle is a low cost product, if you order more you can more lower price. I can find at least 2 suppliers for you, so that you can compare and get an better quality and price.
Look forward to work with you.
Best regards.
William