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Viva Labs ULTRA STRENGTH Glucosamine with Chondroitin and Opti-MSM, Formulated for Guaranteed Joint...
More product info From Viva Labs

Amazon Reviews for  Viva Labs ULTRA STRENGTH Glucosamine with Chondroitin and Opti-MSM, Formulated for Guaranteed Joint Agony Relief, 240 Count
Rating:
715 Ratings
816 Reviews
("Ratings" vs. "Reviews")
50% of potentially unnatural reviews removed (why?)
Adjusted:
View/Edit Adjustment
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Report Info:
Last Updated: Mar 23, 2020
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Note: While Amazon.com claims 715 Ratings, we counted 816 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".

Report Card

Warn Overall Grade
FAIL Unverified Purchases
FAIL Incentivized Reviews
FAIL Suspicious Reviewers
FAIL Overlapping Review History
WARN Deleted Reviews
WARN Rating Trend
WARN Brand Repeats
PASS Word Count Comparison
PASS Phrase Repetition
PASS Reviewer Participation
PASS Reviewer Ease

Most Trusted Reviews

Nice amounts of active ingredients. No tastes, after tastes or ... [Go to full review]
Jan 19, 2020      
100% TRUST
  • Verified Purchaser
  • Take-Back Reviewer (1 deleted Review; avg. rating: 4.0)
  • Brand Repeater (2 of 11 reviews for this brand; avg rating: 4.0)
  • Overrepresented Participation (posted 11 Reviews)
  • Critical Reviewer (avg. rating: 4.3)


Least Trusted Reviews

I've been experiencing severe back pain as the result of ... [Go to full review]
May 3, 2016      
0% TRUST
  • Unverified Purchaser
  • Created on a high volume day
  • Admitted to receiving an incentive
  • Take-Back Reviewer (166 deleted Reviews; avg. rating: 4.4)
  • Brand Repeater (2 of 370 reviews for this brand; avg rating: 4.5)
  • Overlapping Review History: reviewed 2 of 9 top products
  • Critical Reviewer (avg. rating: 4.1)


Analysis Details

Fail Unverified Purchases

420 of the 816 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 4.7 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.

from unverified purchasers

from verified purchases


4.7
4.4


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.

Fail Incentivized Reviews
On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.


104 of the 816 total reviews for this product admitted to receiving a free or discounted product in exchange for a review. Incentivized reviews have rated this product an average of 4.7 while reviews that were not incentivized rated this product an average of 4.5. 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.

from incentivized reviews

from non-incentivized reviews


4.7
4.5


Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.

Fail Suspicious Reviewers

One-Hit Wonders


23 of the 816 reviewers have only reviewed this product. The One-Hit Wonders have rated this product an average of 3.7 while the reviewers who have posted more than one review have rated this product an average of 4.6. 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.

from one-hit wonders

from reviewers with more than one review


3.7
4.6


Take-Back Reviewers


475 of the 816 reviewers have had at least one of their past reviews for another product deleted. The Take-Back Reviewers have rated this product an average of 4.7 while the reviewers who don't have any deleted reviews in their history have rated this product an average of 4.3. 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.

from take-back reviewers

from reviewers without previously deleted reviews


4.7
4.3


Read more about our Suspicious Reviewers test.

Fail Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:

Does not include products
from the same brand


153 of the 816 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.7 while the reviewers who have a more unique product review history rated this product an average of 4.5. 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.

from reviewers with substantial overlapping history

from reviewers without a substantial overlapping history


4.7
4.5


Read more about our Overlapping Review History test.

Warn Deleted Reviews

We discovered a total of 12 deleted Reviews for this product, with an average rating of 5. 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:
  1. 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.
  2. We have no information on reviews that were never published in the first place.
  3. 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.
Read more about our Deleted Reviews test.

5.0 average rating of deleted reviews

5.0


Show distribution of deleted reviews

Warn Rating Trend

  • 20%
  • Created over 27 days

We counted 816 reviews for this product over the span of 1,776 days, an average of 0.5 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 4 or fewer reviews on any given day.

However, we see the following 27 days exceeding this threshold:In total, we found that 165 reviews were created on just 27 days. This is an excessively high number of reviews submitted on these high volume days.

from reviews created on high volume days

from reviews created on normal volume days


4.6
4.5


Read more about our Rating Trend test.

Warn Brand Repeats

Brand Repeaters


292 of the 816 reviewers have reviewed other products for this brand. While this is more Brand Repeaters than we'd expect to see, the discrepancy in ratings between the Brand Repeaters and non-repeaters isn't significant enough to rule out the possibility of it being due to random chance.

from Brand Repeaters

from Non-Repeaters


4.7
4.4


Read more about our Brand Repeats test.

Pass Word Count Comparison

  • 0%
  • Have an overrepresented word count
We didn't find any review word count groups that had a statistically significant greater concentration than what we'd expect to see in this category.
Read more about our Word Count Comparison test.

Pass 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:
19 reviews
(4.7/5)
17 reviews
(4.9/5)
11 reviews
(4.5/5)
20 reviews
(4.7/5)
19 reviews
(4.7/5)
11 reviews
(4.8/5)
8 reviews
(4.6/5)
22 reviews
(4.8/5)
15 reviews
(4.6/5)
Show MoreShow Less
Common Phrases in Titles:
34 reviews
(4.6/5)
21 reviews
(4.6/5)
13 reviews
(4.9/5)


55 of the 816 total reviews for this product use substantial repetitive phrases between them. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from reviews with substantial repetitive phrases

from reviews without substantial repetitive phrases


4.7
4.5


Read more about our Phrase Repetition test.

Pass Reviewer Participation

  • 24%
  • From reviewers with an overrepresented participation

We see the following 1 participation group with a statistically significant greater concentration than what we'd expect to see:In total, we found that 197 reviewers (or 24%) are within an overrepresented participation group. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

From reviewers with an overrepresented participation

From reviewers with a properly represented participation


4.4
4.6


Read more about our Reviewer Participation test.

Pass 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 4.4, while the average ease score for reviewers in this category is 4.4.

4.4 Product's Average Ease Score

4.4 Category's Average Ease Score


4.4
4.4


Read more about our Reviewer Ease test.