( CNN ) -- Federal regulators warned consumers to avoid one brand of vitamin B dietary supplement because it contains potentially harmful anabolic steroids . Preliminary lab tests showed the product , Healthy Life Chemistry By Purity First B-50 , contains methasterone , a controlled substance , and dimethazine , the Food and Drug Administration said . `` Products marketed as a vitamin but which contain undisclosed steroids pose a real danger to consumers and are illegal , '' said Howard Sklamberg , director of the FDA 's compliance office . Regulators received 29 complaints associated with the product , including fatigue , muscle pain and cramps , and liver and thyroid problems , the FDA said . Women also reported unusual hair growth and missed menstruation , and men reported impotence and low testosterone . Some patients were hospitalized , the FDA said in a statement , but no deaths were reported . Anyone who used the product and has symptoms should seek medical care and report the case to the FDA , regulators said . The product manufactured by Purity First Health Products is sold online and in stores . The company has declined to voluntarily recall the product or to warn consumers about the potential for injury , according to the FDA .
FDA : The supplement is linked to 29 complaints . Users reported fatigue , pain , liver and thyroid trouble . Comment: No deaths were reported , but some patients were hospitalized .