Disclaimer
mayoclinic.com : good safety alerts for various supplements
supplementwatch.com : reviews of various supplements
nccam.nih.gov/health/supplements : site of the National Institutes of Health, containing safety alerts and other practical advice
consumerreports.org/mg : provides decent drug and supplement reviews for a yearly fee
Note: due to the more stringent regulation of supplements by the government of Germany, the supplements found and manufactured in Germany are probably in general more likely to contain the ingredients displayed on the labels than similar products from the United States, and possibly less likely to contain ingredients that are unsafe for humans.
Dietary supplements
mayoclinic.com : good safety alerts for various supplements
supplementwatch.com : reviews of various supplements
nccam.nih.gov/health/supplements : site of the National Institutes of Health, containing safety alerts and other practical advice
consumerreports.org/mg : provides decent drug and supplement reviews for a yearly fee
Note: due to the more stringent regulation of supplements by the government of Germany, the supplements found and manufactured in Germany are probably in general more likely to contain the ingredients displayed on the labels than similar products from the United States, and possibly less likely to contain ingredients that are unsafe for humans.