I order 2 * 5kg bags of protein and one of them arrived damaged with a large split down the side of the bag spilling the contents into the delivery box. After 3 weeks of emailing ON customer services... See more
While we don't verify specific claims because reviewers' opinions are their own, we may label reviews as "Verified" when we can confirm a business interaction took place. Read more
To protect platform integrity, every review on our platform—verified or not—is screened by our 24/7 automated software. This technology is designed to identify and remove content that breaches our guidelines, including reviews that are not based on a genuine experience. We recognise we may not catch everything, and you can flag anything you think we may have missed. Read more
See what reviewers are saying
I have been ordering from ON since Jan 2026 since Amazon is restricting the amounts. This time when I ordered, UPS lost a case, I filed a claim with UPS, but was frustrated after not being able to re... See more
I've ordered one 5kg bag of protein powder, and after almost two weeks it hasn't arrived. I've sent an email as well with no response so far.
Company which pushed their product through subscription which cant be canceled. When you try it this message "Your subscription contract is frozen by your shop owner." interrupt the process. Highly re... See more
Company details
Information provided by various external sources
Optimum Nutrition: Creators of 100% Whey Protein (The Worlds #1 Protein Powder), Pro Complex, Diet Products, Strength and Recovery Supplements, and other health and nutrition products.
Contact info
United Kingdom
- www.optimumnutrition.com
No recent history of asking for reviews
This company hasn't invited customers recently, so reviews may not be representative
Replied to 8% of negative reviews
Typically replies within 1 week
How this company uses Trustpilot
See how their reviews and ratings are sourced, scored, and moderated.
I should have checked the rating of…
I should have checked the rating of this company before making an order.
My order has never been delivered and the current status is returning to the sender.
UPD: Customer support issued the refund very quickly

Reply from Optimum Nutrition
Dysfunctional website and incompetent Customer Service
I previously ordered from this site and never had issues but recently I made an order for the Serious Mass supplement. I completed the order via PayPal but got not confirmation via the website, so I tried a second time, still no confirmation. Then I ordered it directly from my debit card which then confirmed. But to my surprise all 3 orders were deducted. The next morning I called the local office in Ireland there was no answer, only an auto prompt talking about a business meeting that was currently in progress. I called the Dutch office which then tranferred me to Germany to tell me the orders were all already dispatched. Then I finally got a response from the Irish office saying they were sorry but did not explain why there was no answer from their phone lines for the whole day. Surely if a meeting is in progress at least 1 person should be taking care of inbound calls? I've asked for my complaint to be escalated but I've had no answer. This company's customer service and website need a real overhaul. What a joke

Reply from Optimum Nutrition
Didn't get my money back after order got cancelled
I ordered optimum nutrition performance whey 2 pack on 14 November 2023 and the order got cancelled from their side, i don't know why and didn't get my money back, so i tried customer care number many time and each time they just say you will get your refund in 1-2 days but till today i didn't get my refund. Today is 31 December.
Edit: Order id- 2631292
2nd edit: sorry, i didn't check the country. Iam from india and ordered whey from optimumnutrition.co.in in india.
Noone from india in optimum nutrition is helping me in any way, so please if you people can help, please help me to get my money back.

Reply from Optimum Nutrition
No delivery, no care
Ordered Whey protein, it was shipped from NL to UK and it took more time than usual. Got a message it was delivered to a pick up location (Tesco store). When I have got there I was told by staff parcel must have already been returned to depo.
I have contacted ON customer support but they are refusing to refund me by saying parcel was delivered. I have got nothing. And who has “signed” for it at Tesco, where is tracking? They don’t care about customers.
ONUK72995174
Edit, to the response below: I was abroad due to urgent personal reasons. Next time you should state the fact there is time limit for the declaration. Also how is the time delay relevant? You weren’t even looking into it with delivery company, just weaseling out of responsibility.
It won’t happen again because I won’t order from you again. I am also convincing my gym buddies to move away from you.

Reply from Optimum Nutrition
UNACCEPTABLE CUSTOMER SERVICE
Bought a 5kilo bag of whey protein and it came with a couple of gifts. When FedEx turned up to the door and handed the box over it weighed less than a kilo. I asked the driver why so light? I got ignored. Opened the box indoors to find no protein and only two free gifts. I examined the box to find additional sellotape on the base of the box. Pictures taken and straight away raised a complaint via email. I got a reply back saying they would not issue a refund or a replacement. I have sent a number of emails to customer support at Optimum Nutrition who just never replies back. I have been trying to call the customer service team but the calls are constantly on divert. DO NOT buy from them you will only be robbed for your money. I have now raised a dispute through Barclays. A massive company like this and they just rob their customers. Absolute joke
UPDATE 19/12/23 On the 18th I received an email from Optimum refusing to give any sort
Of refund or even replace the product. I was instructed to inform the local authorities. So, I took matters in my own hands to investigate. I called Fed Ex who clearly told me that nothing has been raised with them and there is no investigations being handled by fed ex. So, all these emails from Optimum have been nothing but lies I was told that the parcel was weighed at so many points of its journey which is incorrect as Fed Ex confirmed to me that it was only weighed at the time it was handed over from Optimum Nutrition. I’ve never known a company like this. Who doesn’t care about there customers. Furthermore. Where is my consumer rights????
Received Bad Product and No One Providing Suppot
Hi, Global ON Support please help with this.
I purchased Optimum Nutrition Essential Amin.O. Energy | Orange | 270 g product on 17/10/2023, which was delivered to me on 2023-10-20
When I opened the product packaging the silica pouch was broken and it was mixed with the product and also forming lumps, which made it unconsumable, so I reached out to Glanbia/ON Support with All the details and shared all the information including pictures that clearly show the silica gel mixed with the product forming lump.
Since then I have called customer care more than 100 times(Shubham, Kavita, Wonchi) but they are not helping and now they don't receive my calls, or just receive my call and then either drop the call or keep me on hold, I have been waiting for a resolution for more than 1.5 months and all I hear is team is looking into it, My queries are not being heard or sorted.
Moreover, the ON support, Glanbia team asked me to break the silica gel that is present and consume it, this is the nature of the resolution that is being provided to the customer who paid money
I have shared all the details and pictures and have asked several times to provide me with either a replacement or a refund but I am not getting any sort of response from the support.
My order ID is on-2490189 purchased from the India ON Website
Customer support is pathetic from Optimum nutrition in India, Please never buy products from ON unless you are ready for mental torture investing your hard-earned money.
Note: The product delivered to me is 20 Months old and was just about to expire. Purchased in Sep and got product whose manufacturing is in 01-2022 and about to expire in 3 Months.
Update 1::: received from Glanbia India(this is how they reply and treat customers after sending bad products)::::
We are sorry for the inconvenience caused. We investigated the issue and found out that the product was delivered to you intact and without any damage. Also, Optimum Nutrition Amino Energy product is imported from USA, which comes with a vacuum barrier. A vacuum barrier is a cardboard round disk that is not glued to the bottle neck, and it sometimes gets stuck under the cap. It is not there for sanitation or authenticity; its only purpose is to hold the product in place during transportation. Packaging techniques may vary but rest assured that your product is authentic as long as it passes the authenticity check. Hence this vacuum barrier sometimes gets displaced and hence some of the product gets leaked out but be rest assured that the product is genuine and safe for consumption.
Worse customer service ever
Not sure if this website is a scam or not but for sure it is the worse customer service ever.
I bought 4KG of protein isolate and the tracking number does not exist. Also when I contact the customer service email they do not reply.
I wish I could have seen these reviews earlier.

Reply from Optimum Nutrition
Great Tasting Protein
I have taken whey protein from ON for years. I love making protein shakes with these, and I feel they are reasonably priced for what they are.
Disastrous Purchase and Terrible Customer Service
I recently purchased 4Kg of Whey protein from the official website. To my shock and disappointment, what I received was an unsealed, 16-month-old, 2.27Kg product inside a 4Kg delivery package.
The customer service experience has been nothing short of a nightmare. I diligently shared all the necessary evidence with them, hoping for a prompt resolution. However, it has been weeks, and they still haven't addressed the issue or provided any solutions.
What's even more frustrating is that now they have taken to ignoring me altogether. The customer service executive I was in touch with even disconnected our call mid-conversation and is no longer attending my calls.
This entire experience has been nothing but a huge disappointment and a waste of both time and money.
Update: 20/11/2023
I've got the refund for the purchase on 19/11/2023 and the refund was initiated on 17/11/2023.

Reply from Optimum Nutrition
I ordered whey protein from your…
I ordered whey protein from your official website.The order was delivered today when i opened it up i found 1kg bag of salt and 1kg packet of rawa.There was no whey protein inside it.This is a case of fraud.

Reply from Optimum Nutrition
Terrible customer service
They marked my item as delivered even though I didn't receive it I contacted customer service and they confirmed that the parcel in the photo taken by Royal Mail didn't belong to them but they haven't resolve the situation after a few days, very disappointed. poor customer service. never buy again.

Reply from Optimum Nutrition
I ordered 2.5 kg whey protein pack of…
I ordered 2.5 kg whey protein pack of ON Gold Standard with Order Id on-2357594
and they delivered some wrong muscletech brand.
Also, when I open the package found the box already open and there was wheat flour filled inside the box.
Its been 30 days now that My hard earned money Rs 6540 is stuck with them and their customer care team is not supportive at all they keep you busy by asking info videos photos but no resolution.
Now they don't even pick your call on customer care number. No one reply your mails and No help from their whatsapp customer support number.
Whoever is reading this Please don't don't ever buy from this site otherwise you will suffer.
Serious mass not the same!
I used to take the serious mass formula a few years ago and used it for years when bulking. It was a really good tasting shake, now I have tried it again a couple years later, they have completely changed the flavours not the same as it used to be. Unless they go back to how it use to taste, I wont use this product again. Not too sure why they changed it, it was a tasty product before especially the strawberry one, now it tastes so bad.

Reply from Optimum Nutrition
Don't even think about it!
I don't usually give my opinion, either for good or for bad, but this is too much. How on earth is it possible that one of the biggest (if not the biggest) sports nutrition company in the world treats its customers with such disregard and disrespect? 27 days and counting since that 17 of August that I made the mistake of trusting ON Optimum Nutrition online store for my 2.25kg whey protein powder, placed my order and payed. It never arrived. Now they don't reply my emails, probably don't know where my package is, don't seem to care, keep being silent, don't give me my money back… What a horrible customer support. They are forcing me to open a dispute for my money! If anyone can read this before buying from them listen, just don't do it! Find any other of the many good brands out there and go for it. All the pain these people will cause you is not worth it!
-
(21/09/23) Update and reply to ON: Thanks for taking the time to do here what you haven't done yet with my emails and queries, that is to simply reply and try to fix the situation. On 18th and 19th September, out of the blue and one month after my order, Correos (local parcel company) tried to deliver your package. I wasn't home. Today I went to their office to reject it so I guess it will be sent back to you. Hope you didn't expect me to take it one month after my order! I am still waiting for my refund. My order is: ONUK75424162.
-
(29/09/23) Final update: On 22th September I received an email from ON customer support where they acknowledged their fault on the whole situation and gave me what it looked to me like a sincere apology. I really appreciate that. I got a full refund that very same day so my Paypal dispute was automatically closed.

Reply from Optimum Nutrition
Why have a customer care number if…
Why have a customer care number if there is no one sitting on the other side to receive call? The website where you can check your order status shows absolutely no info, most of the columns with shipment info shows NA even after 10 days from order date. And yes I have already emailed the customer support with all details but alas with no response.

Reply from Optimum Nutrition
I ordered my whey protein but it's cancelled without cancellation
I ordered my whey protein from offical on website but it's has been cancelled without cancellation. No customer support I am trying to connect with customer care no one picking the call even I do email still no revert. The worst decision I order this product very disappointed. 0/10 .no customer support it's really sucks even I paid now worried about my money

Reply from Optimum Nutrition
Not impressed with the new flavours…
Not impressed with the new flavours compared to what it used to be.

Reply from Optimum Nutrition
Bought the mass serious mass product
Bought the mass serious mass product. The scoop supplied is far too big for any water bottle. Unless you have a funnel half of it will be wasted. Also for the price the taste isn't that great. Better products out there.

Reply from Optimum Nutrition
Really, really good business and product
great customer service and a brilliant product. I have tried the whey protein and the mass gainer and both were exceptional. WOULD DEFINITELY RECOMMEND!

Reply from Optimum Nutrition
My order took 3 weeks to get to me
My order took 3 weeks to get to me, there courier service who they use (Evri) sent the first order back to another country (the order comes from the Netherlands) simply because there lazy delivery driver couldn't be bothered delivering it, they lead over and over again on the tracking. Things got worse when optimum nutrition said they was sorry for what had happened and would send my order express delivery the second time, (complete lie and they sent it standard delivery) so the so called express delivery took a further 2 weeks to get here, they later admitted they hadn't sent it expresses delivery. Absolute nightmare of a experience and I will never use this company again, if you want your order in delivering in a reasonable amount of time stay well away from this company.

Reply from Optimum Nutrition
The Trustpilot Experience
Anyone can write a Trustpilot review. People who write reviews have ownership to edit or delete them at any time, and they’ll be displayed as long as an account is active.
We use dedicated people and clever technology to safeguard our platform. Find out how we combat fake reviews.
Learn about Trustpilot’s review process.
Here are 8 tips for writing great reviews.
Verification can help ensure real people are writing the reviews you read on Trustpilot.
Offering incentives for reviews or asking for them selectively can bias the TrustScore, which goes against our guidelines.







