I got a question last week from reader Barbara about colloidal silver supplements. For the record, this alternative health remedy is both ineffective and unsafe. It’s the latter that concerns me most, of course. A lot of the things we do for health are ineffective (homeopathy for starters; glandulars are another). Others are actually dangerous (the fat-free diet trend of the 90s that’s contributed to our metabolic syndrome epidemic). Colloidal silver supplements fall into the dangerous category.