One Stop Xtreme + Pre-Workout + Stainless Steel Shaker

£92.97 £39.99

One Stop® Xtreme 2.03Kg


Pre-Workout 300g


Reflex Stainless Steel 750ml Shaker

In stock

What is One Stop Xtreme All in One?

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.

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.

Managing Director James Phillips explains“There are a number of all-in-one bodybuilding supplements on the market at the moment. We’ve always seen 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”.

Who is One Stop Xtreme 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.

What is Pre-Workout?

PRE-WORKOUT is designed for anyone wanting a premium pre-workout supplement which delivers significant doses of the most popular pre-workout ingredients to aid their workout with the trusted performance and quality associated with Reflex Nutrition.

PRE-WORKOUT is not a proprietary mix of ingredients that hides a poor formula. Each serving of PRE- WORKOUT delivers a significant 3,000 mg of citrulline malate, 1,600 mg of beta-alanine, 125 mg of caffeine complimented with B vitamins and a sophisticated electrolyte blend.

Who is Pre-Workout for?

Pre-Workout has been formulated for both male and female individuals.  Formulated to take before a workout,  each serving of PRE- WORKOUT delivers a significant 3,000 mg of citrulline malate, 1,600 mg of beta-alanine, 125 mg of caffeine complimented with B vitamins and a sophisticated electrolyte blend.

Pre-Workout is a vegetarian product, but it is not suitable for vegans or coeliacs.

What are the benefits?

One Stop Xtreme
  • EU sourced whey and micellar casein delivering a massive 55grams of protein
  • Huge BCAA Content – 10,320mg
  • Worlds’ purest and most proven creatine Creapure® Creatine
  • Free form L-Leucine – 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
  • Friendly bacteria
  • Additional vitamins and minerals from A-Z
  • Patented Bioperine® for optimal absorption
  • Lab tested protein content
  • Completely Free from GMO Soy Protein and GMO ingredients
  • Additional vitamins B6 and B12 for reduction of tiredness and fatigue
  • Magnesium contributes to normal muscle function and electrolyte balance
  • 3g of Citrulline Malate per 10g serving
  • 1.6g of Beta-Alanine per 10g serving
  • 125mg of Caffeine per 10g serving

One Stop Xtreme 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.

Pre-Workout Recommended Usage

Mix 10g, which is approximately three level 5ml measures (there is a scoop included in the tub) with 250ml of water and mix thoroughly in a shaker cup until powder has fully dissolved.

Consume 30 minutes before your workout.

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, which 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. Every single batch is 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.

Reflex Nutrition’s PRE-WORKOUT mixes easily, tastes amazing and comes with the trusted guarantee just like every other Reflex Nutrition product.

PRE-WORKOUT is completely free from banned substances and is made in our state the art ISO9001 Quality Controlled registered factory using 100% renewable energy.

How does it taste?

One Stop® Xtreme comes in three delicious flavours:

Chocolate perfection
Strawberries and cream
Vanilla ice cream

Pre-Workout comes in a delicious Fruit Punch flavour.

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.

Pre-Workout product is a food supplement and should be used in conjunction with food as part of a healthy and varied diet, not as a substitute for such. For use pre-workout, recommended consumption is one serving per day. Do not exceed the stated recommended daily dose. High caffeine content. Not recommended for children or pregnant or breastfeeding women (50 mg per 100 ml). Keep out of reach of young children. The scoop included with this product measures by volume not by weight, for precise measurements please use measuring scales. Scoop may settle to the bottom of container during transit. This product is sold by weight, not by number of servings. Storage instructions: Store in a cool, dry place. Once opened always tightly replace the lid onto the container when not in use. Best consumed within three months of opening or by the best before end date, whichever is sooner.

Anything else?

One Stop® Xtreme is 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.

Pre-Workout is available in 300g tubs with 30 servings.

Suitable for

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

One Stop® Xtreme (all flavours) and Pre-Workout have been certified as Halal safe by The Halal Trust.

For further allergy advice, please read our suitability guide.

One Stop® Xtreme Ingredients

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.

Pre-Workout Ingredients

Maltodextrin, Citrulline Malate, Beta-Alanine, Flavouring, Magnesium Bisglycinate, Caffeine, Colour (Beetroot Red), Anti-Caking Agents (Calcium Silicate, Silicon Dioxide), Sweetener (Sucralose), Colour (Beta Carotene (fruit punch variety only)), Colour (Anthocyanin (watermelon variety only)), Pyridoxine Hydrochloride, Methylcobalamin.

One Stop Xtreme

Nutritional Profile


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Nutritional Profile


Product Label



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