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Reviews
4.6
(25)
Average item review
We calculate this number using a recency-weighted average of all ratings, with a rating's value decreasing by half each year to best reflect the current experience.
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Anderson on Sep 22, 2026
5 out of 5 starsFast shipping and really nicely packaged. The serum sinks in super quickly, probably faster than anything else I’ve tried. I’ve only used it for a few days so it’s too early to say much about the KPV, but I like that it’s included. So far I’m really happy with it :)
sami responded on Oct 2, 2026
Thank you so much for the lovely review! 😊 I’m really happy to hear that you’re enjoying the serum and how quickly it absorbs. I truly appreciate you taking the time to share your experience, and I hope you continue to love it!
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Nicolea on Sep 2, 2026
5 out of 5 starsGreat quality. Arrived on time, fast shipping. Made a hair serum, mixed well. Will purchase again. Thank you for the free gift 🎁.
sami responded on Sep 3, 2026
Thank you so much for your review! We’re glad you’re happy with the quality and fast shipping. We truly appreciate your support and look forward to your next order!
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Vinh on Jul 21, 2026
5 out of 5 starsFirst of all, I would like to sincerely thank Sami for the outstanding customer service. That kind of service is not something you come across every day! The communication was excellent as well—Sami responds quickly and is always willing to help if his customers run into any problems. Unfortunately, my products arrived damaged due to the shipping carrier. Sami didn’t hesitate for a second and immediately arranged a replacement shipment. I’m extremely satisfied with how everything was handled. I can wholeheartedly recommend ordering from him to anyone. Thank you again for the amazing service! 🙏 I’m already looking forward to placing more orders in the future.
sami responded on Aug 5, 2026
Thank you so much for your incredibly kind review and for sharing the photo! I truly appreciate your patience and understanding regarding the damaged shipment. I’m very happy that I could resolve the issue for you, and I look forward to your future orders!
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movitz on May 30, 2026
5 out of 5 starsVery fast shipping and the package was packed extremely well. The ghk serum absorbs into the skin much better than many other serums I’ve tried, without feeling heavy or sticky. So far, I’m very impressed with the quality. I’ll come back and update my review once I’ve had more time to see the results. Highly recommended! 😊
sami responded on Aug 5, 2026
Thank you so much for the wonderful review! I’m really glad you’re happy with the fast shipping, packaging, and how the GHK serum feels on your skin. I look forward to hearing about your results!
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KELEN on Mar 7, 2026
5 out of 5 starsI recommend your produIt’s worth a lot
sami responded on May 21, 2026
Thank you so much for the kind words and recommendation! It truly means a lot to hear that you’re happy with the product. Really glad to hear you’re enjoying the GHK-Cu and my other products as well. Your support is greatly appreciated, and you’re always very welcome back.
About RedlineLabSE
Sales
94
On Etsy since 2025
Shop policies
Last updated on
Accepted payment methods
Accepts Etsy Gift Cards and Etsy Credits
Returns & exchanges
See item details for return and exchange eligibility.
More information
Last updated on
Sep 30, 2026
Frequently asked questions
How should the products be stored?
Store products in a cool, dry and dark place away from direct sunlight and excessive heat. Keep containers tightly closed. For peptide powders, refrigeration is recommended for longer-term storage.
Do you offer SubQ peptides?
Yes, we offer a wide range of peptides. Contact us for more information.
Is tracking included?
Yes. All orders are shipped with tracking. Tracking information will be added to your Etsy order once the parcel has been dispatched.
Can I request a custom formulation or strength?
Depending on the product, custom strengths or formulations may be available. Feel free to message me before ordering to discuss what you are looking for.
What happens if my order is lost in transit?
If your order appears to be lost in transit, please contact me through Etsy and I will help investigate the shipment and tracking. Eligible orders may also be covered by Etsy Purchase Protection. If the carrier confirms that the parcel has been lost, we will work together to find the best solution.