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Zahler Vitamin D3 50,000IU, an All-Natural Supplement Supporting Bone Muscle Teeth and Immune...
More product info From Zahler

Amazon Reviews for  Zahler Vitamin D3 50,000IU, an All-Natural Supplement Supporting Bone Muscle Teeth and Immune System, Advanced Formula Targeting Vitamin D Deficiencies, Certified Kosher, 120 Capsulses
Rating:
397 Ratings
398 Reviews
("Ratings" vs. "Reviews")
0% of potentially unnatural reviews removed (why?)
Adjusted:
View/Edit Adjustment
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Report Info:
Last Updated: Jun 14, 2020
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Note: While Amazon.com claims 397 Ratings, we counted 398 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".

Report Card

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

Most Trusted Reviews

3/5
Oct 3, 2019      
100% TRUST
  • Verified Purchaser
  • Take-Back Reviewer (5 deleted Reviews; avg. rating: 5.0)
  • Critical Reviewer (avg. rating: 4.0)


Least Trusted Reviews

The seller of this product has amazing customer service. The ... [Go to full review]
Aug 4, 2018      
38% TRUST
  • Verified Purchaser
  • Take-Back Reviewer (2 deleted Reviews; avg. rating: 5.0)
  • Overrepresented Participation (posted 6 Reviews)
  • Critical Reviewer (avg. rating: 4.3)


Analysis Details

Fail Deleted Reviews

We discovered a total of 92 deleted Reviews for this product, with an average rating of 4.9. 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.

4.9 average rating of deleted reviews

4.9


Show distribution of deleted reviews

Warn Suspicious Reviewers

Take-Back Reviewers


132 of the 398 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.

from take-back reviewers

from reviewers without previously deleted reviews


4.8
4.8


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 4.5, while the average ease score for reviewers in this category is 4.4. While this discrepancy is rather large, it is not quite large enough to rule out the possibility of it being due random chance.

4.5 Product's Average Ease Score

4.4 Category's Average Ease Score


4.5
4.4


Read more about our Reviewer Ease test.


Warn Reviewer Participation

  • 55%
  • From reviewers with an overrepresented participation

We see the following 2 participation groups with a statistically significant greater concentration than what we'd expect to see:In total, we found that 219 reviewers (or 55%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.

From reviewers with an overrepresented participation

From reviewers with a properly represented participation


4.8
4.8


Read more about our Reviewer Participation test.

Pass Rating Trend

  • 0%
  • Created over 4 days
We counted 398 reviews for this product over the span of 2,657 days, an average of 0.1 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 3 or fewer reviews on any given day.

However, we see the following 4 days exceeding this threshold:In total, we found that 0 reviews were created on just 4 days. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Read more about our Rating Trend test.

Pass Unverified Purchases

23 of the 398 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


4.5
4.8


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

  • 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:
28 reviews
(5.0/5)
6 reviews
(5.0/5)
6 reviews
(5.0/5)
11 reviews
(4.8/5)
4 reviews
(5.0/5)
11 reviews
(4.9/5)
17 reviews
(4.9/5)
20 reviews
(5.0/5)
Show MoreShow Less
Common Phrases in Titles:
6 reviews
(5.0/5)
14 reviews
(5.0/5)
3 reviews
(5.0/5)
3 reviews
(5.0/5)
5 reviews
(5.0/5)
7 reviews
(5.0/5)
Show MoreShow Less


38 of the 398 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


5.0
4.8


Read more about our Phrase Repetition test.

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

2% also reviewed:
Fire by Amazon

Does not include products
from the same brand


44 of the 398 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


4.8
4.8


Read more about our Overlapping Review History test.

Pass Brand Repeats

Brand Repeaters


4 of the 398 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


4.5
4.8


Read more about our Brand Repeats test.

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

  • 0%
  • 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.