You can e-mail our customer service department at ngsline@customersvc.com for all subscription inquiries and address changes. Subscribers in the U.S. and Canada can also call toll free: 800 647 5463. International subscribers, call +1 813 979 6845.

Need a back issue? E-mail us at ngs.single@customersvc.com or call 800 777 2800 (+1 813 979 6828 for international callers). Unfortunately, we cannot replace lost issues free of charge or provide reprints of individual articles.