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You can count on us for dedicated customer care. Whether you have a question, a comment, or would like some product information—simply send an email to our customer care email address or call our toll free number below.

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To start a return, visit our Loop Returns Portal.

Items must be returned within 30 days from the date of purchase. Items must be in their original condition with packaging intact.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

**Based on registered ongoing or completed clinical trials under "nicotinamide riboside" on clinicaltrials.gov.

***Based on the top selling dietary supplement brands by revenue per the largest U.S. ecommerce marketplace [identified through a search dated Jan. 1, 2024 – Dec. 31, 2024 using “NAD precursors”]

†In combination with a healthy lifestyle.

‡In reference to physiological (not mental) stress.

§For use beyond 12 weeks, consult a health care professional.