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Douglas Laboratories Ferronyl (with Vitamin C) | Iron Carbonyl with Combination of Vitamins for...
More product info From Douglas Laboratories

Amazon Reviews for  Douglas Laboratories Ferronyl (with Vitamin C) | Iron Carbonyl with Combination of Vitamins for Optimal Health | 60 Tablets
Rating:
171 Ratings
46 Reviews
("Ratings" vs. "Reviews")
4% of potentially unnatural reviews removed (why?)
Adjusted:
View/Edit Adjustment
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Report Info:
Last Updated: May 2, 2022
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Note: While Amazon.com claims 171 Ratings, we counted 46 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".

Report Card

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

Most Trusted Reviews

In 6 weeks these brought my iron from 9.5 g/dL ... [Go to full review]
Mar 29, 2021      
100% TRUST
  • Verified Purchaser
  • Easy Grader (avg. rating: 5.0)


Least Trusted Reviews

The iron supplement irritating my stomach and bowels. Only took ... [Go to full review]
May 4, 2016      
5% TRUST
  • Verified Purchaser
  • Overrepresented word count (16 words)
  • Contains repetitive phrases (show)
  • Take-Back Reviewer (1 deleted Review; avg. rating: 5.0)
  • Overrepresented Participation (posted 10 Reviews)
  • Easy Grader (avg. rating: 4.5)


Analysis Details

Fail Suspicious Reviewers

Take-Back Reviewers


25 of the 46 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


4.6
4.6


Read more about our Suspicious Reviewers test.

Warn Rating Trend

  • 9%
  • Created over 2 days

We counted 46 reviews for this product over the span of 2,546 days, an average of 0.0 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 1 or fewer reviews on any given day.

However, we see the following 2 days exceeding this threshold:In total, we found that 4 reviews were created on just 2 days. Although any days with a larger number of reviews than expected is suspicious, the discrepancy in ratings from reviews created on these high volume days and reviews created on other days isn't significant enough to rule out the possibility of it being due to random chance.

from reviews created on high volume days

from reviews created on normal volume days


5.0
4.6


Read more about our Rating Trend test.

Warn Word Count Comparison

  • 57%
  • 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 26 reviews (or 57%) are within an overrepresented word count group. This is an excessively high number of reviews in overrepresented word count groups.

from reviews with an overrepresented word count

from reviews with a properly represented word count


4.2
4.7


Read more about our Word Count Comparison 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 Reviews:
2 reviews
(3.0/5)
2 reviews
(5.0/5)
3 reviews
(4.7/5)
2 reviews
(5.0/5)
2 reviews
(5.0/5)
2 reviews
(5.0/5)
Show MoreShow Less
Common Phrases in Titles:
7 reviews
(4.3/5)
2 reviews
(5.0/5)
2 reviews
(5.0/5)
2 reviews
(3.5/5)
Show MoreShow Less


9 of the 46 total reviews for this product use substantial repetitive phrases between them. While this is more than we'd expect to see, it does not appear to have a significant impact on the overall rating.

from reviews with substantial repetitive phrases

from reviews without substantial repetitive phrases


4.0
4.7


Read more about our Phrase Repetition test.

Warn Reviewer Participation

  • 65%
  • 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 30 reviewers (or 65%) 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


4.3
4.7


Read more about our Reviewer Participation test.

Pass Unverified Purchases

2 of the 46 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


3.0
4.7


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



12 of the 46 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


4.4
4.7


Read more about our Overlapping Review History 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 4.3. 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

4.3 Category's Average Ease Score


4.4
4.3


Read more about our Reviewer Ease test.


Pass Brand Repeats

Brand Repeaters


3 of the 46 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


3.7
4.7


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.

Pass Deleted Reviews
  • 0
  • Reviews have been deleted
We have not discovered any deleted reviews for this product.

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.