1) Orally/Ingestion is about that best absorption (90%) you can get at home vs. a gel tablet at 60% absorption or a regular pill that is anywhere between 10 to 30% absorption.
2) Show me a list of all the people that died in the United States from Colloidal Silver? I bet it’s far lower than other over the counter medicine such as aspirin and even prescription drugs.
I can only think of 1 person who made his own silver outside the FDA safe practice of 330 parts per million. The guy who died. His brew was 10,000 parts per million that he was drinking two to three times a day. Even at that high level it took years 5 or more to kill him.
The link I provide is 10 parts per million far below the FDA 330 parts per million. This is something for your medicine cabinet and not something you drink on a daily basis.
Exposure-Related Health Effects of Silver and Silver Compounds: A Review
I suggest you jump down to “DISCUSSION” – synopsis – occupational exposure to silver (metallic silver - predominantly through inhalation and insoluble silver) is considered a workplace hazardous material, however as noted, soluble silver compounds (including those taken as “dietary supplements”) are absorbed much more readily and can accumulate in the body at even lower amounts.
But more importantly, there have been no scientific studies that show that orally ingesting colloidal silver cures or prevents any of the many illnesses its peddlers purport. But even if in most cases (absent ingesting significant amounts which can and does most definitely causes argyria and kidney damage and neurological problems such as seizures) even in lower to moderate does, it does no significant harm, by making claims that it is some sort of wonder “drug” that will cure and or prevent a whole host of ills (effective against cancer, staph, strep, influenza, general body infections, inflammation, impaired immune system, fungus toxicity, tonsillitis, Meniere's symptoms, whooping cough, shingles, syphilis, cholera, and malaria, AIDs and most recently Ebola), it may prevent people from seeking legitimate and effective treatment or give them a false sense of security thinking that the colloidal silver will protect them.