MASI Longevity Science Reviews 63

TrustScore 4.5 out of 5

4.3

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Review summary

Based on reviews, created with AI

Reviewers overwhelmingly had a great experience with this company. Customers consistently praise the products for their high quality and effectiveness, noting significant improvements in energy levels, skin appearance, and overall well-being. Many consumers appreciate the brand's commitment to quality control, with easily accessible batch testing results, and consider the supplements to be premium and trustworthy. However, some customers experienced issues with their orders and subscriptions. A few people mentioned receiving products they did not order, while others reported delayed deliveries, with one order being almost two months late. There were also isolated comments about the taste of some supplements and concerns regarding the environmental impact of the product packaging.

What people talk about most

Product

Customers consistently note positive experiences with product. Many reviewers express satisfaction with the... See more

Quality

Reviewers highlight positive aspects of quality, often comparing it to luxury brands. Many customers praise... See more

Subscription

Customers had ambiguous experiences with subscription. Many reviewers expressed satisfaction, praising the... See more

Order

Consumers find order to be ambiguous. While some customers were very satisfied with their orders, noting... See more

Based on these reviews

Rated 4 out of 5 stars

MASI supplements are very high quality which you can already tell just from their packaging, I just wish they were more affordable. No other complaints, the supplements work.

Rated 5 out of 5 stars

A lot of brands, to the unsuspecting eye, skimp out on dosages failing to deliver the intended effect, to offset that you need to take more pills. Masi is very easy to take and already comes pre equip... See more

Rated 5 out of 5 stars

It is my recommendation that anybody over 40 years of age starts supplementing with NMN, it has been proven to boost the NAD molecule which is responsible for all energy production in our body. This i... See more

Rated 5 out of 5 stars

I never write reviews, but these products are worth one. I ordered the nmn + Spermidine combo without expecting anything crazy, let me tell you how wrong I was. My skin, visibly smoother, my energy le... See more


Company details

  1. Vitamin & Supplements Shop
  2. Health and beauty shop

Written by the company

Trusted by over 352,000 longevity enthusiasts – MASI offers German-made, Swiss-tested NMN, Resveratrol, Spermidine, and Fisetin crafted to the highest anti-aging standards. Every supplement is produced in a state-of-the-art facility in Germany using raw materials sourced exclusively from top-tier German suppliers – never from China or India. Each batch is independently tested in Switzerland to ensure exceptional purity, safety, and potency.

The MASI Guarantee

German-made, Swiss-tested supplements crafted to the highest European standards.

We use only premium European-sourced ingredients – never from China or India. Every product is vegan, non-GMO, and free from fillers, allergens, gluten, and lactose. Pharma-grade quality. No shortcuts.

Contact info

4.3

Excellent

TrustScore 4.5 out of 5

63 reviews

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Hasn’t replied to negative reviews

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Rated 5 out of 5 stars

Fantastic!!!

Fantastic!!!! I feel alive again, nmn has changed my life. Been on MASI nmn for the past 3 months, I've been struggling with anxiety for over 10 years and this supplement is the best thing I've ever added to my routine. It took about a month to TRULY kick in but once it did my I was finally able to sustain conversations without rising anxiety regularly! Love everything about this brand!!!

5 January 2026
Unprompted review
Rated 5 out of 5 stars

Honestly impressed with quality and…

Honestly impressed with quality and presentation, something that you would expect from a "luxury" branded supplement.

Package is nice to touch especially the glass bottle which I like very much, the travel jar is made out of hard plastic but I can't complain because its light weight good for carrying. Overall, I'm happy with my subscription.

1 April 2026
Unprompted review
Rated 5 out of 5 stars

Fast & easy communication

Fast & easy communication, had an issue changing my delivery address mid order contacted support and they did it for me. Great service and it shipped fast.

1 April 2026
Unprompted review
Rated 5 out of 5 stars

Wow!

Wow! Absolutely amazing Spermidine from MASI EU is top quality. I've taken it now for a month, the supplement overdelivered above my expectations, I was not expecting skin smoothness so fast! I first bought it after watching a clip online about spermidine cleaning your cells and now I can see the effects.

27 February 2026
Unprompted review
Rated 5 out of 5 stars

Quite amazing the effect

Quite amazing the effect. My wife and I started NMN supplementation around a year ago for our health and right now we have just purchased masi.eu yearly subscription of all 4 products. She was struggling a lot with mood and fatigue since the last birth and now the change is quite visible. Quality is very important and masi seemed the best choice, no complaints.

21 March 2026
Unprompted review
Rated 1 out of 5 stars

I would give zero

I would give zero. I had bought the gift for my wife expecting her to enjoy as it was already second by without any visibal effet, but believing that maybe after some tim ether will be some positive effect. When she opened the box, carton inside was crubled, as if someone had already opened the box before her. After few days of trying to use it she told me taht I feeel very bad like usežing someone had used it already. I have photos beu I do not have time tio waste, I was planning to buy for her more things from Masi, but after this experience it's absolutelly disappointing

19 December 2025
Rated 5 out of 5 stars

Top notch experience

I am using all of MASI's products, the best one being their NMN! I've been on the supplementation program for 3 months now; the way I look and feel is a huge difference.

My skin is visibly clearer and smoother and I feel amazing every day without crashing like I used to, the packaging is very appealing, nice to touch, great brand.

12 March 2026
Unprompted review
Rated 5 out of 5 stars

A real Supplement

It is my recommendation that anybody over 40 years of age starts supplementing with NMN, it has been proven to boost the NAD molecule which is responsible for all energy production in our body. This is something that naturally declines with age so supplementing with its pre cursor which is NMN works to lower your biological age in return. You can still get younger as you get older and that's fascinating. Great efforts from MASI brand, highest quality I've tested.

6 March 2026
Unprompted review
Rated 5 out of 5 stars

Best NMN on the market

Its great. I've been taking NMN for multiple years, with many different suppliers and MASI has been my go-to for the past 6 months. The dosages are high but most important are the batch results, with so much fake NMN it's hard to know exactly what you're getting, this brand eliminates that. Hands down the best NMN on the market!

2 March 2026
Unprompted review
Rated 5 out of 5 stars

I love NMN

I love NMN, been taking it for 3 months now and its been amazing! The energy I get is truly caffeine level, but it's different. Rather than a bump its an equal line of energy throughout the day that feels more natural. I'm a complete fan, it eliminated my brain fog, balanced out my day routine due to more energy, and the packaging makes it all feel premium. An incredible supplement for anyone feeling the energy related effects of aging.

28 February 2026
Unprompted review
Rated 2 out of 5 stars

Inefficient logistics and excessive packaging production – lack of response to reported issues

Unfortunately, I'm not receiving any replies to my messages. The packaging is indeed very nice, with the same number of layers as expensive creams. I think this is completely unnecessary for tablets and generates a lot of waste. I wrote to ask if they have an alternative option for those who don't want to produce unnecessary waste, but no one responded. The same thing happened with orders. I placed two orders and they were being shipped simultaneously. I sent an inquiry about combining orders, but I didn't receive a response. Besides, my first order was delayed by almost two months. Only reporting this and threatening to cancel the order had any effect.

1 December 2025
Rated 5 out of 5 stars

Very good

Very good.
I have been using NMN from masi for a year and it changed my daily life. I am in my 40s with a job that is very time consuming and this supplement makes everything easier. Can't live without it.

25 February 2026
Unprompted review
Rated 5 out of 5 stars

I love these supplements

I love these supplements. I've only taken them 4 months, but I've not missed a day. My hair feels healthier and the supplements are easy to digest. So very good quality. I'm looking forward to more length on my hair and will continue to take them.

19 November 2025
Rated 5 out of 5 stars

Clearer Skin!!!

I am taking fisetin 2 capsules 500mg everyday and I can see visibly clearer skin. Love the product!

20 February 2026
Unprompted review
Rated 5 out of 5 stars

First time I bought MASI was when I…

First time I bought MASI was when I became aware that supplement companies underdose or include toxins in their products. I decided to invest in my health by buying NMN and resveratrol with clear third party testing with results i can see. And I feel them a dramatic increase in my deep sleep and I feel more alive for sure. very impressed

18 February 2026
Unprompted review

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