Quick answer: Most healthy adults tolerate eye nutrients well. Ask a doctor first if you are pregnant, smoke, take blood thinners or retinoids, or already take vitamin A or zinc. Sudden vision changes need an eye doctor urgently.
Check with your doctor first if
- You are pregnant, trying to conceive or breastfeeding (too much preformed vitamin A can harm a developing baby).
- You smoke or used to smoke; ask whether the form of vitamin A suits you, since high-dose beta-carotene raised lung cancer risk in smokers.
- You already take a multivitamin, fish liver oil or another eye or zinc supplement, so you do not double up on vitamin A or zinc.
- You take blood thinners such as warfarin (bilberry may add to their effect).
- You have liver disease, or take retinoid medicines for skin.
- You notice sudden vision changes, flashes, floaters, eye pain or a curtain over your vision. See an eye doctor urgently; a supplement cannot help.
Possible side effects
Mild stomach upset; harmless skin yellowing at very high carotenoid intake.
See eye warning signs.
More Visivra guides
- What Is Visivra? A Plain Guide
- The Visivra Formula, Explained
- Lutein and Zeaxanthin: What AREDS2 Found
- Bilberry and Astaxanthin for Eyes
- Vitamin A and Zinc: Safety Limits
- Eye Warning Signs That Need a Doctor
- Screen Eye Strain: Habits That Help
- Visivra Price and 60-Day Guarantee
- Visivra Reviews: What to Expect
General information, not medical advice. Visivra is a dietary supplement and is not intended to diagnose, treat, cure or prevent any disease.