







Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.
Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.
🔥 Bulk smarter, not harder with the ultimate all-in-one muscle fuel!
One Stop® Xtreme is a premium 4.35kg mass gainer protein powder delivering 55g of high-quality whey protein, 10.3g BCAAs, 5,000mg Creapure® creatine, and 71g of carbs per serving. Enhanced with digestive enzymes and probiotics for superior absorption, plus essential amino acids and vitamins to support muscle growth, immune health, and testosterone production. Made in the UK, Halal certified, and free from hormones, added sugars, and artificial additives, it’s designed for serious athletes seeking efficient, clean bulking.










| ASIN | B004LBIXFI |
| Age Range Description | Adult |
| Allergen Information | Contains: Barley, Egg may contain, Milk, Oat, Wheat |
| Benefits | Muscle Growth |
| Best Sellers Rank | 15,517 in Health & Personal Care ( See Top 100 in Health & Personal Care ) 117 in Whey Nutrition Protein |
| Brand | Reflex Nutrition |
| Brand Name | Reflex Nutrition |
| Country Of Origin | United Kingdom |
| Customer Reviews | 4.4 out of 5 stars 98 Reviews |
| Diet Type | Halal |
| Diet type | Halal |
| Flavour | Chocolate Perfection |
| Global Trade Identification Number | 05033579013077 |
| Item Dimensions | 20.3 x 20.3 x 30.1 centimetres |
| Item Nype Name | HEALTH_PERSONAL_CARE |
| Item Weight | 4350 Grams |
| Item weight | 4350 Grams |
| Manufacturer | Reflex Nutrition Ltd. |
| Manufacturer Contact Information | Reflex Nutrition, Sea View Way, Brighton, BN2 6NT, UK |
| Manufacturer Part Number | 100041435030 |
| Material Type Free | Sugar Free |
| Model Name | Reflex Nutrition One Stop Xtreme Serious Mass PROTEIN POWDER 55g PROTEIN 10.3g BCAA'S, 73g low GI carbs 5,000mg Creatine & Added Vitamins |
| Model Number | One Stop Xtreme |
| Net Content Volume | 16.34 Litres |
| Number of Items | 1 |
| Package Type Name | Tub |
| Product benefits | Muscle Growth |
| Protein Source | Whey |
| Recommended Uses For Product | During Workout |
| Supplement Formulation | Multi-Supplement |
| Unit Count | 4350.0 gram |
P**L
Great product needs smaller scoops
The product is great and I saw very fast results. My only gripe for want of a better word is the scoop size, it would have been better to put in a smaller scoop and say use two scoops as it has a morrow neck on the tub and it is difficult to get the scoop out.
A**5
Great taste!
I've been buying for years. Taste is the standout feature for me, non of that synthetic taste you get with other shakes. No bloating or any of that other stuff either.
M**A
its a great product that really help me push through my prs
its a great product that really help me push through my prs. i went from bench pressing 140 to 160 in 2 months on this product. i was stuck on 140 for ages like 6 months until i used Reflex. cons: its rubbish in taste and doesn't shake all that well hence 4 stars but does the job really well. its also a quality product and probably the best all in one supplement out there. does give some gas sometimes but not as bad as other products. i will be buying again but i would say use one shake a day not two as one is more than enough to feed your body anything else is probably going to be a waste. this way it will also last 2 months and u'll still make serious gains
R**2
Strongly recommend
Very good all in one product. Strongly recommend
M**S
Nicest tasting all in one
Tastes great, very smooth and mixes well. I'm a very slow gainer so its hard to really quantify the gains it has brought me but I know it contains everything I could possible need and is very well priced. + i like supporting a British manufacturer.
D**K
Great supp, a little on the sweet side
Great supp, a little on the sweet side, but better than a few others ive tried over the years(Vanilla is nasty though)! big improvement over endurance and strength...!!
A**N
Taste is very strong and cloying
The taste is very strong and cloying, but it offers good value for money.
M**R
I think it's working.
Flavour is fine. I've started lifting and taking these, and I've gained muscle. I don't know how much the protein powder matters compared to how much lifting matters, but the combination of them definitely works.
J**I
Enttäuscht!
Ich habe das Produkt zum ersten Mal ausprobiert mit der Hoffnung, dass es nicht immer die Markenprodukte sein müssen und andere auch gute Protein Shakes machen können die weniger Geld in der Vermarktung stecken, jedoch ist das bei diesem Produkt nicht der Fall. Ich habe schon einige Shakes ausprobiert und kann sagen, ich hab wirklich einen starken Magen aber nach diesem Shake habe ich jedes Mal Bauchschmerzen und fühle mich aufgeblasen. Weder der Geschmack noch die Konsistent ist gut muss ich sagen, es schmeckt eher nach eine Mischung von Schokolade mit Banane, also sehr künstlich und zu sehr pulverisiert was oft einem einen komisches Gefühl beim trinken gibt. Ich würde es ehrlich gesagt am liebsten zurück schicken, wenn ich könnte. Also definitiv keine kauf Empfehlung meinerseits.
Trustpilot
3 weeks ago
3 weeks ago