Built by an ophthalmologist, for everyone who wants to protect what they see.
NADefense exists to answer one question patients kept asking: beyond glasses, drops, and checkups, what else can I do for my eyes?
Thirty years in the exam room led here.
Dr. Craig Fishman is a board-certified ophthalmologist. For three decades he watched the same pattern: patients doing everything right, exams, glasses, sunglasses, diet, and still experiencing the slow, predictable changes of aging vision.
The research pointed somewhere his prescription pad could not reach: cellular energy. The retina is among the most metabolically demanding tissues in the body, and NAD⁺, the molecule that powers it, declines steadily with age.
Sight Guard is his answer. Five evidence-informed ingredients, one daily capsule, formulated to his own clinical standard, and part of his own morning routine.
Craig Fishman, MD · Founder & Medical Advisor, NADefense
Three rules we formulate by.
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Start upstream
Address the mechanism, cellular energy, not just the symptoms downstream of it.
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Proof, not adjectives
Every claim traces to a mechanism or a number. No miracle language, ever.
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Formulate like a physician
Full doses, disclosed amounts, no proprietary blends. The standard a doctor would demand.
Held to a clinical standard.
GMP-certified facility
Manufactured in the USA under current Good Manufacturing Practices.
Third-party tested
Every batch verified for identity, potency, and purity by an independent lab.
Full disclosure
Exact amounts on the label. No proprietary blends, no fillers.
Clean formula
No gluten, dairy, soy, artificial colors, or preservatives.
One capsule a day, formulated by the physician who takes it himself.
- GMP certified
- Made in the USA
- Third-party tested