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Prime Labs - Men's Test Booster - Natural Stamina, Endurance and Strength Booster - 60 Caplets
More product info From Prime Labs

Amazon Reviews for  Prime Labs - Men's Test Booster - Natural Stamina, Endurance and Strength Booster - 60 Caplets
Rating:
46,549 Ratings
25,078 Reviews
("Ratings" vs. "Reviews")
13% of potentially unnatural reviews removed (why?)
Adjusted:
21,888 Reviews




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Report Info:
Last Updated: Sep 8, 2020
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Note: While Amazon.com claims 46,549 Ratings, we counted 25,078 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".

Report Card

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

Most Trusted Reviews

1/5
This stuff made my whole body break out, wont use ... [Go to full review]
May 29, 2018      
59% TRUST
  • Verified Purchaser
  • Overrepresented word count (14 words)
  • Overrepresented Participation (posted 3 Reviews)
  • Critical Reviewer (avg. rating: 3.0)


Least Trusted Reviews

After taking this product for about one month I have ... [Go to full review]
Jul 31, 2018      
0% TRUST
  • Verified Purchaser
  • Created on a high volume day
  • Admitted to receiving an incentive
  • One-Hit Wonder
  • Overrepresented Participation (posted 1 Review)
  • Easy Grader (avg. rating: 5.0)


Analysis Details

Fail Deleted Reviews

We discovered a total of 9,735 deleted Reviews for this product, with an average rating of 4.5. 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.

4.5 average rating of deleted reviews

4.5


Show distribution of deleted reviews

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.


55 of the 25,078 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 3.1 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


3.1
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 Reviewer Participation

  • 52%
  • 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 13056 reviewers (or 52%) are within an overrepresented participation group. These reviews have rated this product an average of 4.6, while all other reviews 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 reviewers with an overrepresented participation

From reviewers with a properly represented participation


4.6
4.3


Read more about our Reviewer Participation test.

Warn Rating Trend

  • 12%
  • Created over 59 days

We counted 25,078 reviews for this product over the span of 925 days, an average of 27.1 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 46 or fewer reviews on any given day.

However, we see the following 59 days exceeding this threshold:In total, we found that 2,957 reviews were created on just 59 days. Although any days with a larger number of reviews than expected is suspicious, these reviews do not appear to have a significant impact on the overall rating.

from reviews created on high volume days

from reviews created on normal volume days


4.5
4.5


Read more about our Rating Trend test.

Warn Suspicious Reviewers

One-Hit Wonders


4,081 of the 25,078 reviewers have only reviewed this product. While this is more One-Hit Wonders than we'd expect to see, the discrepancy in ratings between the One-Hit Wonders and reviewers who have posted more than one review isn't significant enough to rule out the possibility of it being due to random chance.

from one-hit wonders

from reviewers with more than one review


4.6
4.5


Read more about our Suspicious Reviewers test.

Warn 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 4.2. While this discrepancy is rather large, it is not quite large enough to rule out the possibility of it being due random chance.

4.4 Product's Average Ease Score

4.2 Category's Average Ease Score


4.4
4.2


Read more about our Reviewer Ease test.


Pass Unverified Purchases

409 of the 25,078 total reviews for this product are unverified purchases. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from unverified purchasers

from verified purchases


4.3
4.5


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.

Pass Word Count Comparison

  • 27%
  • 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 1 group with a statistically significant greater concentration than what we'd expect to see:In total, we found that 6,871 reviews (or 27%) are within an overrepresented word count group. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from reviews with an overrepresented word count

from reviews with a properly represented word count


4.5
4.5


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 Titles:
431 reviews
(4.5/5)


163 of the 25,078 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


4.5
4.5


Read more about our Phrase Repetition test.

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



1,534 of the 25,078 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.

from reviewers with substantial overlapping history

from reviewers without a substantial overlapping history


4.6
4.5


Read more about our Overlapping Review History test.

Pass Brand Repeats

Brand Repeaters


226 of the 25,078 reviewers have reviewed other products for this brand. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from Brand Repeaters

from Non-Repeaters


4.7
4.5


Read more about our Brand Repeats test.