I receive daily spam from this company from 50 different email addresses (shown below some of the addresses and fake sender names they use). I had to seek help from our IT department t... See more
Company replied
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I receive daily spam from this company from 50 different email addresses (shown below some of the addresses and fake sender names they use). I had to seek help from our IT department t... See more
Company replied
Agreed with many here about the non appearance of the Rizz ring. Especially disappointing as a previous user of Nightrider which I found helpful I was happy to invest in the promised ring. As indic... See more
Company replied
Crappie company delays since July order was supposed to be sent by October again delays i am opting for a refund its been 2 weeks of my request and kept ignoring me. Cannot trust them . Product also l... See more
Company replied
I have been using freestyle libre pro sensor for last 3 years and for last 2 years i am using Ambrosia's Blucon Nightrider with it. It helps me convert my sensor into a continous glucose monitor witho... See more
Ambrosia is a technology company, maker of electronic device BluCon which reads NFC tag and uses CR2032 battery, it can send data to any Bluetooth enabled connected device. It can be used for many different purposes like NFC-based payment, ticketing, c...
Market Street 1, 94105, San Francisco, United States
Replied to 100% of negative reviews
Typically takes over 1 month to reply
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Ordered CGM System from this company. Really nice and a helpful product & very easy to use. Go for it 👍
I ordered the RIZZ smart ring a while back and I’ll be honest, the delivery did take longer than I expected, which was a bit frustrating at first. But once it finally arrived and I started using it, my experience changed quite a bit. The ring is very lightweight and comfortable, you almost forget you’re wearing it. The tracking feels reliable for daily use, especially for sleep, stress, and overall energy patterns. What I liked most is that it gives you a better understanding of how your body is reacting throughout the day, rather than just showing basic numbers. Despite the slow delivery, I’m actually glad I got it and have been enjoying using it regularly.
1. Great customer support
2. Timely delivery of cgms and accessories
3. Original high quality products provided
4. Excellent app , includes experts support
5. Value for money
I preordered a Rizz ring in August of 2025, #246565. I received a sizing kit in September 2025 which I sent in the day after receiving it. On September 30, 2025, I received an email saying “Your RIZZ will now be ready November 15, 2025.
Since then, I’ve received 2 emails saying my ring will be shipping soon. On February 16, 2026, I received an email saying that they were out of black and silver color Rizz rings and could they ship me a Gold color ring. I replied any color would be fine. I’ve not heard back since.
Ridiculous.

Reply from Ambrosia Systems
I receive daily spam from this company from 50 different email addresses (shown below some of the addresses and fake sender names they use). I had to seek help from our IT department to filter this heavy load of spam. Why does anyone trust a company which resorts to such corrupt business practices?
ambrosia.care
ambrosia.systems
ambrosiasys.com
ambrosiasystem.com
ambrosiasystemsinc.com
ambrosiasystems.us
rizzhealth.com
rizzcgm.com
Sender names are:
contact@
fmia@
helen.mayer@
laura.mayer@
mia.flaherty@
mia@

Reply from Ambrosia Systems
The rizz ring ordered but not yet received.
Its been more than 4 months now.
No response from customer care to emails. Messages etc.
When I opened case with PayPal. They immediately replied that they have gold color available but I hadn't approved and they created a shipping label on UPS to delay the PayPal case.
This is scam company. Keep away

Reply from Ambrosia Systems
Agreed with many here about the non appearance of the Rizz ring. Especially disappointing as a previous user of Nightrider which I found helpful I was happy to invest in the promised ring.
As indicated by others getting the size kit took time but arrived eventually. Many contacts with promises but no actual product delivery. I mail received end of Jan telling me it was being shipped next week. Guess what… no shipping info and no product
They must be having a considerable laugh at the diabetic community.

Reply from Ambrosia Systems
I ordered the Rizz ring back in August of 2025. It’s now February of 2026 and I haven’t received it yet. I’ve contacted them multiple times demanding a refund but each time they say that it’s about to ship but ignore my refund request. It’s become obvious that this is nothing more than a scam company. Please avoid!!

Reply from Ambrosia Systems
Crappie company delays since July order was supposed to be sent by October again delays i am opting for a refund its been 2 weeks of my request and kept ignoring me. Cannot trust them . Product also looks like a scam the RISS RING. AVOID ...although they acknowledged refund I had to keep asking and being ignored and look at the other reviewers same story. Poor customer service and doubtful about the technology and people are not getting their items. Avoid cleaning clear hassle had they paid me when asked I would not have written this

Reply from Ambrosia Systems
I am sharing my experience to help other customers make an informed decision.
Order 246592 involved the purchase of smart ring Rizz. As part of the process, I received a sizing sample rings box, which is normal and expected.
However, the final product was never delivered.
Multiple tracking numbers were generated for the shipping (after 2 months of delay) neither of which shows confirmed carrier acceptance or delivery. One appears stalled, the other last tracking was 2 weeks ago from JFK.
The only shipment successfully delivered was the sizing sample using UPS in September.
Despite this, a tracking related to a different shipment was provided to PayPal, which resulted in the case being closed, even though the final product had not been received.
The order still appears as ON HOLD on the company website, and fast shipping (39 USD) was paid but not provided.
I have repeatedly requested either delivery with proper express shipping or a refund, without resolution so far.
This review reflects documented facts and my direct experience.
UPDATE – December 30, 2025
Additional tracking was shared after this review, but the product has still not been delivered and fast shipping was not provided. The situation remains unresolved.
1-04-2026
In reply ad Ambrosya:
Thank you for your reply.
A refund does not resolve the core issue.
The product itself does not work as expected, and this is the main problem — not just the delay or the communication.
Receiving an item late is one thing. Receiving an item that simply doesn’t deliver what it promises is another.
Your response focuses on logistics, but completely avoids addressing the actual performance and reliability of the product.
From a customer’s perspective, this feels like a generic reply rather than a real attempt to take responsibility.
I hope you will take this feedback seriously, because improving shipping is not enough if the product itself is not effective.
In replay:
Dear Ambrosia Team,
Thank you for your reply.
However, stating that the product “is functioning as intended” does not reflect my experience as a customer.
A product should work reliably in real-world conditions, not only under ideal setup assumptions. If correct setup, specific conditions, or additional guidance are required to obtain basic functionality, this should be clearly communicated upfront.
From my side, the issue was not a lack of willingness to use the product correctly, but the fact that the results did not match what was promised.
Offering step-by-step support after the purchase does not change the initial experience, which was disappointing.
At this point, my feedback remains the same: the problem is not just usability, but the overall reliability and consistency of the product in everyday use.
I hope this helps you better understand the customer perspective.
3th april 2026
Dear Ambrosia Team,
Thank you for your reply.
I appreciate the acknowledgment, but I would like to clarify a few important points.
The explanation related to setup, placement, or individual physiology does not align with my experience. I have tested the ring on different fingers and under normal usage conditions, and the results remain inconsistent.
At the same time, I am currently using other sensors and another smart ring, all under the same conditions, and they provide stable and reliable data. This makes it unlikely that the issue is related to my physiology or usage.
For this type of product, reliability should not depend on “ideal conditions” or extensive troubleshooting after purchase. It should work consistently in everyday use.
I also find it important to highlight that this follow-up is happening several months after my initial experience, which impacts the overall perception of support and responsiveness.
I remain open to testing improvements, but based on my experience so far, the core issue appears to be related to data reliability rather than setup or usage.
Regards,
Stefania
BTW
I have installed and tested the beta version of the app, but the same issues remain.
At this point, it is possible that my specific unit is defective. However, I am not willing to spend additional money on returns or replacements, considering the initial cost of around €300 and the experience so far.
For comparison, the same amount would cover several weeks of reliable measurements using dedicated sensors.
I am fully aware that a smart ring cannot match the accuracy of a medical-grade sensor. However, I would expect at least consistent and regular readings.
Currently, the data is irregular and unreliable — for example, multiple readings within a short time frame followed by long gaps of several hours — which makes the system difficult to trust in everyday use.

Reply from Ambrosia Systems
Just spoke with a rep of Ambrosia Systems about receiving continued SPAM email marketing from them which I have attempted to unsubscribe from on many occasions.
The rep informed me that he had just removed me from their email database and then ended the conversation with 'If you want continue to live
in stone age that is your wish. Ambrosia products
are most advanced in the world.'
Please, do yourself a favour, do not hand over any money or personal information to this company as they do not respect their customers wishes and now have become insulting.

Reply from Ambrosia Systems
I have reached out to this company twice about removing my email address from their marketing campaign. Both times they have said my email address was removed. However since this claim I have received at least 8 more SPAM emails from them. I have no intention of buying any of their products so what function does it achieve to keep sending me SPAM?
Be careful if you give any of your personal information to this company as once they have it they will be in constant contact and you cannot do anything about it.

Reply from Ambrosia Systems
The BluCon NightRider has transformed my diabetes management experience, offering unparalleled convenience and freedom. Its seamless integration with various continuous glucose monitoring systems ensures real-time, reliable data on my smartphone. The user-friendly app provides easy navigation and personalized alerts, while the extended battery life adds to its overall convenience. This device has become my silent guardian, empowering me with the peace of mind to monitor glucose levels discreetly and make informed decisions. For anyone seeking a game-changing solution in continuous glucose monitoring, the BluCon NightRider is a must-have, elevating both the practicality and positivity of daily diabetes care

Reply from Ambrosia Systems
It is really nice product and make life easy , Team is well supported all the time , thanks to all

Reply from Ambrosia Systems
I received a spare part ambrosia blucon lid. The ridges are not flat. Its a used piece.Once the coin is used the ridges jut out. With multiple uses only this happens. If it's a fresh piece it wil be flat. Pls contact me I can share an image
My email id : rohini.s20@gmail
I am reviewing Ambrosiasys NightRider again because I have not received a reply to two problems with this company.
The biggest problem is that I purchased a waterproof NightRider on 11/03/2023. I had some problems with the batteries and connectivity. After trying several things it settled down and began giving good results. As of June 30, 2023, I have not received a reading. Problem: All new sensors suppled by my mail order pharmacy have expiration dates after 11/30/2023.
If an item they sold no longer works as specified in their sales information, regardless if the NightRider connects, Ambrosiasys should give a full refund or exchange with one that works.
As of now the NightRider I have is a piece of JUNK.
Don’t waste your money. Customer service is nonexistent.
LinkBluCon has taken the stress out of glucose monitoring. As a diabetic, I've struggled with constant pricking and testing. This app has changed the game with its accurate and timely readings. The trend analysis and history tracking are invaluable for understanding my body's responses. Thank you, LinkBluCon, for making diabetes management a whole lot easier! 🙌
As someone with diabetes, the Linkblucon app has been an absolute game-changer. The ease of cgm right on my smartphone is a dream come true. The app's intuitive interface, real-time data, and customisable alerts have empowered me to manage my glucose levels like never before.
That's very awesome because I have also getting tired of being poked blood from these fingers and it is very pain full . I get reference from my neighbour
to purchaser the sensor with nightrider device of blucon it is a CGM that monitors our activities continuously all day and
night and in this you have to calibrate only one time for starting this device . It is very helpful in monitoring the food that we consume without knowing that
what amount of sugar it has in it so
it help me to balance my sugar level by posting in food insight option that it has to post a meal picture every time you had a meal and it shows a graph where my glucose level goes up
to eat that particular food.
I also tried 2-3 CGM systems but after few time they gave me lots of issues and also too much expensive for me then i switch to blucon real-time cgm system and it is budget friendly as compare to the DEXCOM and other CGM systems.
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