Frequently Asked Questions

Sight Guard is a daily dietary supplement formulated by a board-certified ophthalmologist. It is designed to support cellular energy and antioxidant balance in the eye as part of a long-term vision wellness routine.*

Sight Guard is designed for adults who want to take a proactive role in supporting their long-term eye health. Whether you have a family history of age-related eye concerns or simply want to complement your existing care, Sight Guard fits into a responsible daily wellness routine.*

No. Sight Guard is a dietary supplement, not a treatment, drug, or replacement for any prescribed therapy. It is designed to complement your existing care routine. Never adjust or stop prescribed medications without guidance from your healthcare provider.

NADefense was founded by a board-certified ophthalmologist who recognized that many people wanted to do more for their eye health beyond standard appointments. Sight Guard was formulated with clinical perspective and a deep understanding of the published research on cellular energy support in the eye.*

Sight Guard contains five active ingredients: Nicotinamide Riboside (NR) 300 mg, Calcium Pyruvate 400 mg, CoQ10 100 mg, Ginkgo biloba 60 mg, and Lutein 10 mg. Each was selected based on published, peer-reviewed research into cellular energy, antioxidant defense, and healthy circulation.*

Nicotinamide Riboside (NR) is a form of Vitamin B3 that the body converts into NAD+, a molecule involved in cellular energy production. Unlike niacinamide, NR does not cause flushing and has not been associated with elevated homocysteine levels at the doses used in Sight Guard.*

Each ingredient was selected based on published, peer-reviewed research exploring its role in supporting cellular energy, antioxidant defense, or healthy circulation in the eye. We encourage you to review the summaries on our Science page and discuss them with your healthcare provider.*

Yes. Sight Guard is manufactured in a GMP-certified facility in the United States and undergoes third-party testing for purity, potency, and contaminant screening. We take quality control seriously because trust is the foundation of our brand.

Take one capsule daily with a meal and a full glass of water. Consistency matters more than timing. Most subscribers incorporate it into their morning routine.

Sight Guard is formulated with well-studied ingredients at responsible doses. However, Ginkgo biloba may interact with blood thinners. If you take anticoagulants or any prescription medications, consult your physician before starting. Always disclose all supplements to your healthcare team.

The ingredients in Sight Guard are generally well-tolerated at the doses used. Some individuals may experience mild digestive sensitivity when starting any new supplement. If you experience any adverse effects, discontinue use and consult your healthcare provider.

Dietary supplements support cellular function gradually and consistently. Most subscribers take Sight Guard as a long-term daily habit. Changes in clinical measurements are assessed by your doctor over months, not days. This is a marathon, not a sprint.*

When you subscribe, Sight Guard is delivered to your door every 60 days. You save on each order compared to one-time purchases, and you can pause, skip, or cancel at any time from your account dashboard. No contracts, no penalties.

Yes. Cancel anytime with no fees or penalties. Log into your account and cancel before your next billing date. Your first order is also covered by our 30-day money-back guarantee.

Orders typically ship within 1-2 business days. Standard delivery within the continental United States takes 3-5 business days. You will receive a tracking number by email once your order ships.

We offer a 30-day money-back guarantee on your first order. If you are not satisfied, contact our team within 30 days of delivery for a full refund. Subsequent subscription orders are not eligible for returns once shipped.

NADefense is a wellness company, not a medical practice. While our founder is a board-certified ophthalmologist, our products are dietary supplements and do not constitute medical advice, diagnosis, or treatment. Always consult your healthcare provider for medical guidance.

You can reach us through our Contact page or by emailing support@nadefense.com. Our team typically responds within one business day, Monday through Friday, 9 AM to 5 PM EST.