The Health Sciences Institute isn't known to be a scam, however, it is unaccredited by the Better Business Bureau, and currently holds a B- rating with them, as of 2015. More than 50 percent of the complaints filed with BBB are related to products and services.
The Health Sciences Institute appears under the Better Business Bureau as New Market Health, LLC. The Health Sciences Institute website contains a disclaimer that the contents of their website should not be construed as medical advice, and much of their marketing focuses on products sold by their partners. While they might not be a scam, the efficacy of their products is not guaranteed.