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Bilberry Extract Benefits: Do the Vision Claims Hold Up?
Bilberry extract is popular for eye health, but the evidence is mixed, and it may add to blood thinners and lower blood sugar. The Reviralis label lists bilberry fruit extract 8th in a 661 mg blend, at most 82.62 mg per serving, with no amount printed. No source ties it to herpes.
Written by the Goreviralis label deskUpdated · 5 min read
What are the bilberry extract benefits people claim?
The usual claim is better night vision and eye comfort, credited to anthocyanins, the dark purple pigments in the berry.
The evidence is mixed. Memorial Sloan Kettering lists vision uses among the reasons people buy bilberry, and it flags cautions in the same entry: the extract may add to blood thinners and may lower blood sugar (MSK About Herbs, Bilberry Fruit). A claim that sells well and a claim that has strong trials are different things.
When you read a bilberry trial, check three things: how many people, how long, and whether the product was a standardized extract. Small, short studies with a stated pigment level say little about a capsule that lists none.
How much bilberry is in Reviralis?
The label does not say. Bilberry fruit extract is 8th of 18 names in a 661 mg blend, so it can hold at most 82.62 mg per serving.
US rules list blend members from most to least by weight (21 CFR 101.36), so the 8th name holds no more than 661 divided by 8. The real figure may be much lower. The label also prints no anthocyanin level, which is the number a bilberry trial would report.
| Item | What is printed |
|---|---|
| Name | Bilberry fruit extract |
| Blend position | 8th of 18 |
| Amount | Not printed |
| Anthocyanin level | Not printed |
| Ceiling per serving | At most 82.62 mg |
Does bilberry interact with medicine?
It may. The MSK entry notes possible effects with blood thinners and on blood sugar (MSK About Herbs, Bilberry Fruit).
That fits a pattern across the blend. Grape seed, DHA and vitamin E carry their own bleeding notes, covered in the grape seed post. Each is small, and the sum is hard to judge from a label that hides the blend amounts.
"This capsule lists bilberry fruit extract. I take a blood thinner or diabetes medicine. Does that matter, and should I be tested differently?"
Reviralis: from $49 a bottle60 capsules a bottle · 2, 3 or 6 bottles · free US shipping on 3 and 6 · 60-day money-back guarantee
See packsWhat should you do about eye symptoms?
See an eye doctor. A supplement is not a substitute for an exam, and sudden changes need prompt care.
Pain, redness with light sensitivity, a gritty feeling, sudden blurring or loss of vision should be seen urgently, and herpes involving the eye is a reason to get care quickly. Do not wait on a capsule.
The label asks you to consult your healthcare provider before use if you are pregnant or nursing, have a medical condition, have a history of seizures, or take prescription medicine. Keep taking prescribed medicine, including any antiviral, and call 911 for sudden vision loss with severe headache, confusion or stiff neck.
Is bilberry a reason to choose Reviralis?
No. The vision evidence is mixed, the amount is hidden and no source tested this capsule.
If you still like a multi-ingredient capsule, compare it with the claims on the benefits page, the names on the ingredients page and the costs on the pricing page. For another blend name with a long claim list, see olive leaf.
FAQ01
Reviralis questions people ask
Does bilberry improve eyesight?
Evidence is mixed. Memorial Sloan Kettering lists vision among its common uses without strong proof. See an eye doctor for any vision change instead of relying on a supplement.
Can bilberry thin the blood?
It may add to the effect of blood thinners, per Memorial Sloan Kettering. If you take warfarin, aspirin or similar medicine, ask your prescriber before using any bilberry product.
How much bilberry is in Reviralis?
The label does not print it. Bilberry fruit extract is 8th of 18 names in a 661 mg blend, so it holds at most 82.62 mg per serving.
Does bilberry lower blood sugar?
It may. People on diabetes medicine should ask a pharmacist, because effects could add up.
What are anthocyanins?
They are the purple pigments in bilberries and similar fruit. Trials often report their level. The Reviralis label does not print one.
Who wrote this02
Written and reviewed by
Pages built from the label, the sales page and linked NIH, CDC, FDA, FTC, Mayo Clinic and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is the information site for a U.S. stocking partner for Reviralis. It is not the manufacturer or the distributor named on the label. We earn money when you buy through our order links.
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