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BULKSUPPLEMENTS.COM Vitamin D3 5000IU Powder (125mcg) - Vitamin D Supplement for Bone and Immune...
More product info From BULKSUPPLEMENTS.COM

Amazon Reviews for  BULKSUPPLEMENTS.COM Vitamin D3 5000IU Powder (125mcg) - Vitamin D Supplement for Bone and Immune Support, Cholecalciferol - Gluten Free, Soy Free - 50mg per Serving (100 Grams - 3.5 oz)
Rating:
497 Ratings
304 Reviews
("Ratings" vs. "Reviews")
43% of potentially unnatural reviews removed (why?)
Adjusted:
View/Edit Adjustment
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Report Info:
Last Updated: Jan 7, 2023
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Note: While Amazon.com claims 497 Ratings, we counted 304 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".

Report Card

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

Most Trusted Reviews

Crazy value. 10000 servings this will probably last me the ... [Go to full review]
Dec 22, 2020      
100% TRUST
  • Verified Purchaser
  • Critical Reviewer (avg. rating: 2.3)


Least Trusted Reviews

My BulkSupplements Pure Vitamin D3 has arrived, and, once again ... [Go to full review]
Mar 21, 2015      
0% TRUST
  • Verified Purchaser
  • Contains repetitive phrases (show)
  • Brand Loyalist (7 of 13 reviews for this brand; avg rating: 5.0)
  • Overlapping Review History: reviewed 1 of 9 top products
  • Easy Grader (avg. rating: 4.7)


Analysis Details

Fail Deleted Reviews

We discovered a total of 27 deleted Reviews for this product, with an average rating of 4.6. 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.

4.6 average rating of deleted reviews

4.6


Show distribution of deleted reviews

Fail Brand Repeats

Brand Repeaters


222 of the 304 reviewers have reviewed other products for this brand. This is an excessively large percentage of Brand Repeaters which may indicate unnatural reviews.

from Brand Repeaters

from Non-Repeaters


4.7
3.9


Brand Loyalists


21 of the 304 reviewers have reviewed multiple products but half or more of their reviews are for this brand. This is an excessively large percentage of Brand Loyalists which may indicate unnatural reviews.

from Brand Loyalists

from Non-Loyalists


4.7
4.4


Read more about our Brand Repeats test.

Fail Suspicious Reviewers

One-Hit Wonders


8 of the 304 reviewers have only reviewed this product. The One-Hit Wonders have rated this product an average of 3.1 while the reviewers who have posted more than one review have 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 one-hit wonders

from reviewers with more than one review


3.1
4.5


Take-Back Reviewers


177 of the 304 reviewers have had at least one of their past reviews for another product deleted. This is an excessively large percentage of Take-Back Reviewers which may indicate unnatural reviews.

from take-back reviewers

from reviewers without previously deleted reviews


4.5
4.5


Read more about our Suspicious Reviewers test.

Fail Overlapping Review History


103 of the 304 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 4.3. 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 substantial overlapping history

from reviewers without a substantial overlapping history


4.7
4.3


Read more about our Overlapping Review History test.

Warn 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:
2 reviews
(5.0/5)
3 reviews
(4.7/5)
3 reviews
(4.7/5)
2 reviews
(5.0/5)
2 reviews
(5.0/5)
2 reviews
(5.0/5)
Show MoreShow Less


38 of the 304 total reviews for this product use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.

from reviews with substantial repetitive phrases

from reviews without substantial repetitive phrases


4.6
4.4


Read more about our Phrase Repetition test.

Pass Rating Trend

  • 2%
  • Created over 2 days

We counted 304 reviews for this product over the span of 3,393 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 2 or fewer reviews on any given day.

However, we see the following 2 days exceeding this threshold:In total, we found that 6 reviews were created on just 2 days. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from reviews created on high volume days

from reviews created on normal volume days


5.0
4.4


Read more about our Rating Trend test.

Pass Unverified Purchases

119 of the 304 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


4.4
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

  • 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 Reviewer Participation

  • 0%
  • From reviewers with an overrepresented participation
We didn't find any participation groups that had a statistically significant greater concentration than what we'd expect to see in this category.
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 4.3, while the average ease score for reviewers in this category is 4.3.

4.3 Product's Average Ease Score

4.3 Category's Average Ease Score


4.3
4.3


Read more about our Reviewer Ease 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.


7 of the 304 total reviews for this product admitted to receiving a free or discounted product in exchange for a review. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from incentivized reviews

from non-incentivized reviews


4.4
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.