One Stop Xtreme All in One

From: £52.99

4.60 out of 5
  • Newly improved all-in-one bodybuilding protein shake
  • 55g protein, 10.3g BCAAs and 73g carbs per serving
  • EU sourced whey protein and micellar casein
  • Contains Creapure® Creatine for high-intensity energy
  • Added zinc, magnesium and 100% RDA of vitamins
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What is One Stop Xtreme All in One?

One Stop® Xtreme is the ultimate all in one bodybuilding supplement; in fact we firmly believe it’s the best of its type in the World. Why? Well at Reflex Nutrition we’re experts at making all in one bodybuilding supplements, we’ve been making them much, much longer than most, our first was made way back in 1997. So our experience is really second to none and as a result One Stop® Xtreme delivers a complete powerhouse of the world’s finest sports supplements in research based doses all in one easy to use shake, and with more high-quality ingredients than ever before, we are so confident in its ability that if you find an alternative that you think is better, we’ll refund you in full for the lifetime of the product.*

One Stop® Xtreme contains just about every supplement that’s been scientifically proven for bodybuilders and packs them into one effective shake that is designed with your training and your results in mind. One Stop® Xtreme is designed to replace the use of numerous supplements, allowing bodybuilders to simply take one shake and know their nutritional needs are covered, alongside a balanced and healthy diet.

Who is it for?

One Stop® Xtreme has been formulated for male and female bodybuilders looking to supplement their training with a product of unparalleled quality and effectiveness. One that delivers a superior source of protein and proven nutrients all in one high-performing product, which also tastes delicious. One that comes with a guarantee to build muscle or your money back.

One Stop® Xtreme is a vegetarian product, but it is not suitable for vegans or coeliacs.

Managing Director James Phillips explains“There are a number of all-on-bodybuilding supplements on the market at the moment. We’ve always see OSX as the market leader in terms of composition and quality since it contains numerous premium ingredients like Creapure Creatine and has always been free from soy protein. But now we’ve really taken things to another level with OSX. The partnership with Albion®, the addition of Betaine Anhydrous and the work with LAB2PRO® means that OSX is in a different league”.

What are the benefits?

  • EU Derived Whey and Micellar Casein delivering a massive 55grams protein
  • Lab tested protein content
  • Completely Free from GMO Soy Protein and GMO ingredients
  • Huge BCAA Content – 10,320mg
  • Patented, Worlds’ Purest and Most Proven Creatine Creapure® Creatine
  • Patented Bioperine® for optimalabsorption
  • Huge added L-Leucine free form – 3,000mg
  • Scientifcally proven dose of Betaine Anhydrous – 2,600mg
  • Huge dose of Beta Alanine – 1,800mg
  • Huge dose Taurine – 1,500mg
  • Patented Albion® Magnesium – 150mg
  • Patented Albion® Zinc – 7.5mg
  • Digezyme® – 145mg
  • Patented Bifidobacterium Bifidum – 362,500,000 CFU
  • Patented Lactobacillus Acidophilus – 362,500,000 CFU
  • Patented Lactobacillus Rhamnosus – 362,500,000 CFU
  • Additional vitamins and minerals from A-Z

Recommended Usage

Mix 145g, which is approximately four and a half level 60ml measures (there is a scoop included in the tub) with 600ml of water and mix thoroughly in a shaker cup or blender.

We recommend on training days that one serving is taken mid-morning between meals and one serving after a workout.

On non-training days take two servings, one mid-morning between meals and one serving in the afternoon between meals.

How is it made?

Reflex Nutrition’s state of the art all in one bodybuilding supplement One Stop® Xtreme is made at the Reflex Science Park in the U.K, it is one of only a handful of factories in the World which is ISO9001 registered for quality control but is also an Informed Sport Registered Site. Each and every batch of One Stop® Xtreme is carefully made to exacting quality control and auditing procedures ensuring 100% traceability of every high quality ingredient that goes into producing this market leading all in one supplement. At the end of each run every single batch is then tested in our lab to qualify its label claims for protein content. Be in absolutely no doubt the quality and effort that goes into making this bodybuilding supplement.

How does it taste?

One Stop® Xtreme comes in three delicious flavours:

Chocolate perfection
Strawberries and cream
Vanilla ice cream

The science behind it

Each serving of One Stop® Xtreme contains everything a bodybuilder needs from a protein supplement. Its designed to outperform the competition in every single conceivable angle * see table. One Stop Xtreme is not the result of guesswork, its is the result of decades of experience and the ability to understand and extrapolate real data from real studies relating to sports performance. As a result it is not by chance that One Stop Xtreme delivers 55g protein, 10.3g BCAAs, 73g low GI carbohydrates, 5,000mg Creapure® Creatine, 100% RDA of daily vitamins, LAB2PRO® friendly bacteria and DigeZyme digestive enzyme complex, every shake delivers a powerful serving to ensure you get the most out of your training and diet.

Added amino acids include pure free form L-Leucine; Beta Alanine; Betaine Anhyrdous and Taurine. Vitamins and minerals, including patented Albion® zinc and magnesium, contribute to the maintenance of normal protein synthesis, normal function of the immune system, normal testosterone production, protein synthesis, and normal cognitive function.

Quite simply, it is the Benchmark by which all others are measured.

Anything else?

Available in 2.03kg tubs with 14 servings and 4.35kg tubs with 30 servings.

One Stop® Xtreme’s sister product, One Stop® All in One is also available through Reflex Nutrition.

Suitable for

  • Vegetarians: Yes
  • Vegans: No
  • Coeliacs: No

One Stop® Xtreme (all flavours) has been certified as Halal safe by The Halal Trust.

For further allergy advice, please read our suitability guide.


Premium Protein Blend (42% – of which Whey Protein Concentrate [71%] [MILK], Native MILK Protein (29% – of which 80% Micellar Casein, 20% Native Whey Protein), Low GI Carbohydrate Complex (20% – of which OAT Flour [50%], BARLEY Flour [10%]), Maltodextrin, Glutamine Peptides [WHEAT], Cocoa Powder (chocolate varieties only), Creatine Monohydrate (Creapure®), L-Leucine, Betaine Anhydrous, Flavourings, Beta Alanine, L-Taurine, Magnesium Bisglycinate, Thickener (Carboxymethyl Cellulose), L-Choline Bitartrate, Natural Colouring (Betanin [strawberry flavour only]), Enzyme Complex (Digezyme®), Sweetener (Sucralose), L-Ascorbic Acid, Colour (Beta Carotene [vanilla flavour only]), Sweetener (Stevia), Zinc Bisglycinate, Tocotrienols (DeltaGold®), Iron Bisglycinate, Multi Component Protected Lactic Acid Bacteria (LAB2PRO® [Bifidobacterium Bifidum, Lactobacillus Acidophilus, Lactobacillus Rhamnosus]), Nicotinamide, Coper Bisglycinate, Natural Colouring (Anthocyanin [strawberry flavour only]), Selenomethionine (Selenium SeLECT®), Piperine Extract (Bioperine®), Retinyl Acetate, D-Calcium Pantothenate, Cholecalciferol, Pyridoxine Hydrochloride, Thiamine Hydrochloride, Riboflavin, Chromium Picolinate, Folic Acid, D-Biotin, Methylcobalamin.

Nutritional Profile


Product Label


6 reviews for One Stop Xtreme All in One

  1. jonograham1971
    5 out of 5


    TRULY amazing stuff, used it now for 6 or 7 weeks and my strength has gone up nicely along with my weight. Put on approx. 3kgs of solid muscle verified by my Tanita bodyfat scales. Very impressive. Mixes well in the shaker I got with it and I have to say that it actually tastes pretty nice which is the cherry on the cake!

  2. Andrew Simonds
    5 out of 5


    As the adverts says, its the real deal. I have yet to find a single other all-in-one bodybuilding supplement that delivers anything like the ingredients found on One Stop X. It mixes in a shaker with ease and tastes fine, it could have a slight better taste but I guess you cant have everything. I prefer to compromise slightly on flavour than an inferior formula, especially when the results from One Stop have been so good.

  3. Lee


    Wow!! What a company!! What a product!! You will not find anything else like this product for quality, mixability and RESULTS!! I love this product. I’m packing on serious amounts of muscle and saving over £100 a month compared to when I was buying my supplements seperately, Reflex has done an outstanding job on this one!!

  4. Robert
    4 out of 5


    Used this on and off now for a few months and I’m quite impressed. I have increased my strength and filled out a bit putting on 5lbs of lean muscle whilst losing a small amount of fat which is a bonus. Flavours are o.k and mixes nicely in the standard plastic shakers. Quality of the product is obviously top class.

  5. G Money
    5 out of 5


    I don’t normally bother writing reviews but this stuff is worthy. I love this, honestly don’t waste your money on any other products as this really has it all, no other product I’ve seen has so many vitamins included and everything you need to gain muscle fast, the only thing it doesn’t do is lift the weights for you but it does makes it easier. Strawberries and cream is yum. thanks for a great product.

  6. Adam
    4 out of 5


    Actually its the best i have ever had , but just a little high price in my country ..while im consuming 2 per month

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