Penn Herb Wellness Guide
Night Blindness
- Reliable and relatively consistent scientific data showing a substantial health benefit.
- Contradictory, insufficient, or preliminary studies suggesting a health benefit or minimal health benefit.
- For an herb, supported by traditional use but minimal or no scientific evidence. For a supplement, little scientific support.
Our proprietary “Star-Rating” system was developed to help you easily understand the amount of scientific support behind each supplement in relation to a specific health condition. While there is no way to predict whether a vitamin, mineral, or herb will successfully treat or prevent associated health conditions, our unique ratings tell you how well these supplements are understood by some in the medical community, and whether studies have found them to be effective for other people.
For over a decade, our team has combed through thousands of research articles published in reputable journals. To help you make educated decisions, and to better understand controversial or confusing supplements, our medical experts have digested the science into these three easy-to-follow ratings. We hope this provides you with a helpful resource to make informed decisions towards your health and well-being.
| Supplement | Amount | Why |
|---|---|---|
Beta-Carotene | If deficient: 10,000 to 25,000 IU daily |  [3 stars] Night blindness may be an early sign of vitamin A deficiency. Supplementing with beta-carotene, which the body converts into vitamin A, help correct such a deficiency and improve night blindness. |
Vitamin A | If deficient: 10,000 to 25,000 IU daily | [3 stars] Night blindness may be an early sign of vitamin A deficiency. Doctors often recommend supplementing with vitamin A per day to correct a deficiency. |
Zinc | If deficient: 15 to 30 mg daily (with 1 to 2 mg copper daily, to prevent depletion) | [3 stars] A lack of zinc may reduce the activity of retinol dehydrogenase, an enzyme needed to help vitamin A work in the eye. Zinc helps night blindness in people who are zinc-deficient. |
Bilberry | Refer to label instructions |  [1 star] Bilberry is high in flavonoids that speed the regeneration of the pigment used by eye for night vision. Supplementing with bilberry has been shown to improve dark adaptation in people with poor night vision. |
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The information presented by TraceGains is for informational purposes only. It is based on scientific studies (human, animal, or in vitro), clinical experience, or traditional usage as cited in each article. The results reported may not necessarily occur in all individuals. Self-treatment is not recommended for life-threatening conditions that require medical treatment under a doctor's care. For many of the conditions discussed, treatment with prescription or over the counter medication is also available. Consult your doctor, practitioner, and/or pharmacist for any health problem and before using any supplements or before making any changes in prescribed medications. Information expires December 2025.