You can order online and have it shipped there are no customs regulations against it, and the tax would be minimal but would not recommend for human use.
The FDA banned colloidal silver sellers from claiming any therapeutic or preventive value for the product, noting colloidal silver was being marketed for numerous diseases without evidence of safety or effectiveness. As a result, the product now has the status of a dietary supplement in the US; it can be promoted with general "structure-function" claims, but cannot be marketed as preventing or treating any illness. Following this ruling, the FDA has issued numerous Warning Letters to Internet sites that have continued to promote colloidal silver as an antibiotic or for other medical purposes.
In 2002, the Australian Therapeutic Goods Administration (TGA) found there were no legitimate medical uses for colloidal silver and no evidence to support its marketing claims. Given the associated safety risks, the TGA concluded "efforts should be made to curb the illegal availability of colloidal silver products, which is a significant public health issue."
The chronic intake of silver products and the silver buildup from colloidal silver can result in an accumulation of silver or silver sulfide particles in the hair, skin, kidneys, liver, heart and muscles due to high methionine-containing proteins, such as keratin, myosin, tropomyosin, troponin, and key dipeptide glutathione. Serious neurologic (such as seizures), renal, or hepatic complications, as well as headaches, stomach distress, fatigue, and skin irritation have been reported. if ingested, colloidal silver may react with certain drugs, such as Penicillamine, thyroxine, quinolones, and tetracyclines. One death has been reported in the medical literature which the authors felt was due to silver toxicity resulting from repeated oral ingestion of colloidal silver. Colloidal silver can reduce the absorption of some medications, including tetracycline and quinolone antibiotics and can bind to penicillamine, thereby reducing the effectiveness of those medications.
Your information is all wrong or hypocritical...If you like to help don't say thinks that are not true. Colloidal silver have been use for centuries for cure all kind of sicknesses and diseases. FDA banned it because of that fact and because the Big Pharma cannot profit from Colloidal silver...If you are FDA troll screw you but if are just an ignorant person then is all fine by me. If you still think I talk nonsense and you know everything here is some education for you : in this video you can see what Colloidal silver does to bacteria: