Basically yes nano-silver is more accurate for what you want for internal use colloidal silver could also be ionic silver which is unstable and when taken internally will immediately combine with chloride to form an insoluble compound of silver chloride. A fairly new process using HVAC has made the production and cost of true nano-silver much more available at an affordable price. When shopping for silver pay attention to these things and you should end up with a good product. Should say "nano-silver" and they will probably be bragging about their process in the description. PPM should be about 20 (30 or under). Don't go for the ones that say 200 or more. They are doing it wrong. Should be crystal clear. (you can't see nano particles) If it's yellow the particles are big enough to reflect light. particle size should be less than 0.1 microns in diameter.