NEW YORK (TheStreet) -- Shares of GNC Holdings Inc. (GNC) - Get Report are lower by 5.84% to $46.15 on heavy volume in late morning trading on Tuesday, following New York State Attorney General Eric Schneiderman's announcement of the formation of a coalition of state attorneys general from Connecticut, Indiana and Puerto Rico to investigate the business practices of the herbal supplement industry.

"This multistate partnership brings together top law enforcement officers representing nearly 30 million Americans as they seek to ensure that herbal supplement manufacturers and retailers comply with the law," the announcement said.

The coalition is looking to make sure the industry is taking the steps needed to validate their marketing claims.

The forming of the alliance comes after the New York State Attorney General's office found contaminants, unlabeled plant species, and other substances in some store brand supplements.

Retailers, including GNC, Target (TGT) - Get Report, Walmart (WMT) - Get Report, and Walgreens (WBA) - Get Report, were forced to pull products from their shelves so investigators could test their quality and verify claims made on supplement labels such as "gluten free" and "hypoallergenic," the New York Times reports.

Separately, TheStreet Ratings team rates GNC HOLDINGS INC as a Buy with a ratings score of B. TheStreet Ratings Team has this to say about their recommendation:

"We rate GNC HOLDINGS INC (GNC) a BUY. This is driven by some important positives, which we believe should have a greater impact than any weaknesses, and should give investors a better performance opportunity than most stocks we cover. The company's strengths can be seen in multiple areas, such as its growth in earnings per share, notable return on equity, good cash flow from operations, expanding profit margins and increase in net income. We feel these strengths outweigh the fact that the company has had lackluster performance in the stock itself."

Highlights from the analysis by TheStreet Ratings Team goes as follows:

• GNC HOLDINGS INC has improved earnings per share by 16.0% in the most recent quarter compared to the same quarter a year ago. The company has demonstrated a pattern of positive earnings per share growth over the past two years. We feel that this trend should continue. During the past fiscal year, GNC HOLDINGS INC increased its bottom line by earning $2.81 versus $2.72 in the prior year. This year, the market expects an improvement in earnings ($3.15 versus $2.81).
• The return on equity has improved slightly when compared to the same quarter one year prior. This can be construed as a modest strength in the organization. When compared to other companies in the Specialty Retail industry and the overall market, GNC HOLDINGS INC's return on equity exceeds that of the industry average and significantly exceeds that of the S&P 500.
• Net operating cash flow has significantly increased by 189.48% to $65.77 million when compared to the same quarter last year. In addition, GNC HOLDINGS INC has also vastly surpassed the industry average cash flow growth rate of 9.17%.
• 38.72% is the gross profit margin for GNC HOLDINGS INC which we consider to be strong. Regardless of GNC's high profit margin, it has managed to decrease from the same period last year. Despite the mixed results of the gross profit margin, GNC's net profit margin of 8.52% compares favorably to the industry average.
• GNC, with its decline in revenue, underperformed when compared the industry average of 14.2%. Since the same quarter one year prior, revenues slightly dropped by 0.7%. The declining revenue has not hurt the company's bottom line, with increasing earnings per share.
• You can view the full analysis from the report here: GNC Ratings Report