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Preventa Migraine Relief- Natural Daily Headache Prevention Supplement- 1 Month Supply 60 Caps-...
More product info
From Family Tree Remedies
This report was last updated 1/1/2023.
Refresh the report to view the most up-to-date data available:
Refresh the report to view the most up-to-date data available:
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Report Info:
Note: We only analyze "reviews" and ignore one-tap "ratings".
*This is only a Preliminary Report
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Report Card
Pass Overall Grade
FAIL 
Deleted Reviews
Deleted ReviewsFAIL Unverified Purchases
Unverified PurchasesWARN Suspicious Reviewers
Suspicious ReviewersWARN Word Count Comparison
Word Count ComparisonWARN Phrase Repetition
Phrase RepetitionPASS Rating Trend
Rating TrendPASS Overlapping Review History
Overlapping Review HistoryPASS Reviewer Ease
Reviewer EasePASS Brand Repeats
Brand RepeatsPASS Incentivized Reviews
Incentivized ReviewsN/A Reviewer Participation
Reviewer Participation
Most Trusted Reviews
Literally changed my life. I've struggled with migraines+vertigo seasonally for ... [Go to full review]
Apr 18, 2022
100%
TRUST
TRUST
-
Verified Purchaser
-
Easy Grader (avg. rating: 4.5)
One-Hit Wonder
Least Trusted Reviews
Didn't help at all. I will not be ordering again, ... [Go to full review]
May 4, 2016
0%
TRUST
TRUST
-
Unverified Purchaser -
Contains repetitive phrases (show)
-
Never-Verified Reviewer -
Take-Back Reviewer (1 deleted Review; avg. rating: 5.0) -
Critical Reviewer (avg. rating: 1.0)
Overrepresented word count (129 words)
Single-Day Reviewer (posted all reviews on Nov 7, 2014)
Overlapping Review History: reviewed 2 of 9 top products
Analysis Details
Fail Deleted Reviews
Deleted Reviews
We discovered a total of 12 deleted Reviews for this product, with an average rating of 4.2. Even though deleted reviews don't affect the average rating, the fact that action was taken to delete reviews raises some red flags about the integrity of the reviews for the product as whole.
There are a few limitations to keep in mind regarding the Deleted Reviews test:
- We don't have a magic ability to collect every single deleted review; we can only identify reviews as deleted if we collect them on one date and then notice they are no longer visible on a subsequent date.
- We have no information on reviews that were never published in the first place.
- We also don't know why these reviews were removed. It could be action from the platform, personal decision by the review author, part of an entire account closure, even some data error on our part, etc.
4.2 average rating of deleted reviews
Fail Unverified Purchases
Unverified Purchases
27 of the 891 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 2.5 while the verified purchasers have rated this product an average of 4.4. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.
Unverified purchases may be the result of Kindle Unlimited readers, buyers who didn't pay full price, or reviewers who did not purchase the product at Amazon. Read more about our Unverified Purchases test.
Warn Suspicious Reviewers
Suspicious Reviewers
Take-Back Reviewers
Approximately 45% of reviewers have had at least one of their past reviews for another product deleted. While this is more Take-Back Reviewers than we'd expect to see, it does not appear to have a significant impact on the overall rating.
Warn Word Count Comparison
Word Count Comparison
-
- ~80%
- Have an overrepresented word count
In the graph above, we can see the distribution of review word counts for this product and the expected distribution for this category. We see the following 2 groups with a statistically significant greater concentration than what we'd expect to see:In total, we found that approximately 80% are within an overrepresented word count group. This is an excessively high number of reviews in overrepresented word count groups.
Warn Phrase Repetition
Phrase Repetition
Reviews that contain one of these phrases are NOT necessarily devalued; read more about how this test works here.
Common Phrases in Reviews:
Show MoreShow Less
~3% of reviews
(5.0/5)
(5.0/5)
~3% of reviews
(5.0/5)
(5.0/5)
~5% of reviews
(5.0/5)
(5.0/5)
~3% of reviews
(3.0/5)
(3.0/5)
~3% of reviews
(3.0/5)
(3.0/5)
~3% of reviews
(5.0/5)
(5.0/5)
~3% of reviews
(1.0/5)
(1.0/5)
~5% of reviews
(4.7/5)
(4.7/5)
~3% of reviews
(3.5/5)
(3.5/5)
~3% of reviews
(5.0/5)
(5.0/5)
Common Phrases in Titles:
~3% of reviews
(5.0/5)
(5.0/5)
Approximately 15% of reviews use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.
Pass Rating Trend
Rating Trend
-
- <10%
- Created on high-volume days
We didn't notice any signals that would indicate reviews were created unevenly over time.
Read more about our Rating Trend test.
Read more about our Rating Trend test.
Pass Overlapping Review History
Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
<10% also reviewed:
PlantFusion Complete Meal All Plant Based Pea... by PlantFusion
<10% also reviewed:
It Could Happen To Anyone: Why Battered Women Stay by Brand: SAGE Publications, Inc
<10% also reviewed:
Sightmark .45 ACP Boresight with Red Laser by Sightmark
<10% also reviewed:
Kwikset 96870-100 Belleview Single Cylinder... by Kwikset
<10% also reviewed:
Ana Bath 5-Inch Anti-Clog High Pressure 3-Way... by Ana Bath
<10% also reviewed:
Frost King EPDM Rubber Self-Stick Weatherseal... by Frost King
<10% also reviewed:
Folex Instant Carpet Spot Remover 128oz Pack of 4 by FOLEX
Does not include products
from the same brand
from the same brand
Less than approximately 10% of reviewers have substantial overlapping product review history. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Pass Reviewer Ease
Reviewer Ease
The ease score is the average rating for all reviews that a given reviewer submits. The average ease score for reviewers of this product is 4.1, while the average ease score for reviewers in this category is 4.3.
4.1 Product's Average Ease Score
4.3 Category's Average Ease Score
Read more about our Reviewer Ease test.
Pass Brand Repeats
Brand Repeats
Brand Repeaters
We didn't detect a substantial amount of Brand Repeaters.
Pass Incentivized Reviews
Incentivized Reviews
On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.
-
- <10%
- Admitted to receiving an incentive
We didn't detect any reviews that used language indicating they were incentivized.
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.