Reflex Nutrition

Reflex One Stop Xtreme (4.35kg) + FREE BCAA Intra Fusion

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Reflex One Stop Xtreme is our best selling all in one gainer at Echo Supplements. One Stop Xtreme boasts an ingredient profile that many brands imitate but none come close to; from high quality protein (no soy) and carbohydrates (no sugars) and with active ingredients like Creapure creatine monohydrate, beta alanine and branched chain amino acids in HIGH doses you can trust Reflex One Stop Xtreme when looking to add strength and size!

Reflex One Stop Xtreme is our best selling all in one gainer at Echo Supplements. One Stop Xtreme boasts an ingredient profile that many brands imitate but none come close to; from high quality protein (no soy) and carbohydrates (no sugars) and with active ingredients like Creapure creatine monohydrate, beta alanine and branched chain amino acids in HIGH doses you can trust Reflex One Stop Xtreme when looking to add strength and size!

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ONLY £65.29
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Reflex One Stop Xtreme (4.35kg) + FREE BCAA Intra Fusion + Reflex R-Bars (12x60g)
ONLY £71.11
Reflex One Stop Xtreme

Echo Supplements on Reflex One Stop Xtreme

Reflex One Stop Xtreme is Reflex Nutritions all in one weight gainer - the benefit of choosing One Stop Xtreme over similar products is that you know exactly what you are getting, there is no proprietary blend (secret formula) but instead just good solid, reliable ingredients - here are some of the most important:

  • Quattro Protein - This is a blend of whey protein concentrate, isolate and hydrolysate alongside milk protein concentrate (high in casein). This combination provides a good comproimise between fast and slow releasing protein sources for a truly time released protein blend. Importantly it does not contain soy protein.
  • LOW GI, Organic Carbohydrates - Why low GI? Your body breaks down low GI carbs slower than high GI carbs like sugars. This means you will feel fuller for longer, are less likely to store the calories as fat and won't feel hungry soon after using Reflex One Stop Xtreme
  • Branched Chain Amino Acids & Leucine - Branched Chain Aminos are the amino acids Leucine, Isoleucine and Valine and are found in whey protein and are the amino acids most responsible for protein synthesis (muscle repair) - with One Stop Xtreme you get very large doses of BCAAs and additional Leucine - these are not cheap ingredients and it is very rare to get them in this quantity (10.5g) in an all in one product - typically you will get between 5-8g in most competitors products
Reflex One Stop Xtreme Key Facts
  • Creapure Creatine Monohydrate - Creatine monohydrate is the most researched supplement around and has been shown many times to boost performance by up to 10% - you can read more about Creapure creatine at this link: Creapure Creatine
  • Glutamine Peptides - L-Glutamine is the most abundant amino acid in your body, and could greatly help with preventing muscle breakdown. Glutamine Peptides are a more bioavailable form of glutamine and work better in a blend where there are other ingredients competing to be absorbed

At Echo Supplements we believe the above ingredients are the most important parts of Reflex One Stop Xtreme, and have highlighted them for this reason - you can find the manufacturer's decription below for even more information!

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.

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 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 Are The Benefits of Reflex One Stop Xtreme?

  • 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

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”.

How Is One Stop Xtreme 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 One Stop Xtreme

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.

Reflex Nutrition - Informed Sport

Informed Sport

Manufactured in an Informed-Sport registered UK site by:
Reflex Nutrition Ltd, The Science Park, Sea View Way, Brighton, BN2 6NT

Reflex Nutrition - Vegetarian

Suitable For Vegetarians

Reflex One Stop Xtreme is suitable for those following a vegetarian diet.

Reflex Nutrition - Albion Minerals

Albion Minerals

Albion Minerals are the world leaders and innovator in mineral amino acid chelate technology meaning that the minerals found in Reflex Nutrition products from Albion Minerals are of a superior highly bioavailable form.

Reflex Nutrition - Halal Certified

Halal Certified

Reflex Nutrition are a partner of the Halal Trust which certifies that this product is suitable for anyone that wants to ensure their supplements are Halal.

Nutritional Information Per 145g Serving
Nutritional Information Per Single (145g) Serving Daily (290g) Serving
Calories 535 1069
Protein 55g 110g
Carbohydrates 69.2g 138.4g
- of which sugars 2.3g 4.6g
Fat 3.2g 6.4g
- of which saturates 1.3g 2.6g
- monounsaturates 0.95g 1.9g
- polyunsaturates 0.75g 1.5g
Fibre 4.2g 8.4g
Salt 0.95g 1.9g
Vitamins & Minerals
Vitamin A 400ug 801ug
Vitamin D3 7.5ug 15ug
Tocotrienols (DeltaGold) 7.5mg 15mg
Vitamin C 100mg 200mg
Thiamin 100mg 200mg
Niacin 1.6g 3.2g
Vitamin B6 1.6mg 3.2mg
Folic Acid 100ug 200ug
Vitamin B12 1.25ug 2.5ug
Biotin 80ug 160ug
Pantothenic Acid 3mg 6mg
Magnesium 150mg 300mg
Iron 8mg 16mg
Zinc 7.5mg 15mg
Copper 803.5ug 1,607ug
Selenium 27.5ug 55ug
Chromium 50.5ug 101ug
Added Active Ingredients
BCAAs 10,320mg 20,640mg
Creatine (Creapure) 5,000mg 10,000mg
L-Leucine (free form) 3,000mg 6,000mg
Betaine Anhydrous 2,600mg 5,200mg
Beta Alanine 1,800mg 3,600mg
L-Taurine 1,500mg 3,000mg
Enzyme Complex (Digezyme) 145mg 290mg
Choline 100mg 200mg
Piperine (BioPerine) 5mg 10mg
Bifodobacterium Bifidum 362,500,000 CFU 725,000,000 CFU
Lactobacillus Acidophilus 362,500,000 CFU 725,000,000 CFU
Lactobacillus Rhamnosus 362,500,000 CFU 725,000,000 CFU

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.

Mix 145g (approximately four and a half level 60ml measures) with 400ml of water and mix thoroughly in a shaker cup or blender. On training days take one serving mid morning between meals and one serving after your workout. On non training days take two servings, one mid morning between meals and one serving in the afternoon between meals.

Reflex Nutrition

Reflex Nutrition produce some of the most highly regarded and recognisable on the supplements market today. With over two decades of experience, Reflex combine health and fitness to create a range of products which have you covered both in and outside of the gym.

Who are they?

Founded in 1996, Reflex Nutrition are based in Brighton, England, and run their own powder, capsule, drinks and bar manufacturing facilities, which makes them unique within Europe. This means that they have complete control over the manufacturing of their products, allowing for only the highest quality of product to leave their factory.

Reflex have always strived to produce the very best products that combine efficacy and broader consideration for general health. Their wide range of supplements cover everything from sports supplements to supplements for general health and wellbeing, making them one of the most versatile brands operating today.

Reflex Nutrition Key Supplements

Even with such a diverse range of products Reflex have still managed to produce a number of category leaders. Reflex One Stop Xtreme is one of the most popular weight gainers available and delivers outstanding results every time. This all in one is immense for gaining strength and size and is a must try for anyone looking to add some bulk.

Reflex also have a number of key supplements in other categories. Their 100% Whey Protein is known for its high quality and great taste, while their Thermo Fusion fat burner is one of our most popular products in the category.


We will take every effort to get you goods to you as efficiently and effectively as possible. All orders placed before 3pm will be shipped on the day of ordering subject to payment authorization and item availability.

Any items which are out of stock will be shipped as soon as they become available. If this causes a delay in your delivery, you will be notified and your order dispatched as soon as possible. If any items are unavailable, you will be contacted and offered a replacement or refund.

UK Delivery

If your order total is under £50 then you can choose one of:

  • Royal Mail Tracked - £2.95
    (1-3 Working Days)
  • DPD Next Day - £4.95
    (Guaranteed Next Working Day + 1 Hour Delivery Window)

If your order total is over £50 then you can choose

  • Royal Mail Tracked - FREE
  • DPD Next Day -1/2 Price - Only £2.49

Please be aware that the prices above are for areas classed as "UK Mainland" by DPD which does NOT include offshore islands, Scottish highlands or Northern Ireland.

Non-UK Delivery

Our website has a comprehensive postage system which takes into account the weight of your delivery and the destination address - to get a quote for your order please add the products you'd like to buy to your basket, go to the basket page and fill in the "Estimate Shipping & Tax" section to get the price.

BFPO Addresses

This shipping method is available for British Forces Posted Overseas and addresses only. Shipping is as with all other UK mailing but please check to see that the size and weight of your order does not exceed maximums for your BFPO destination number by checking with the BFPO website.

Please note that once we have shipped the item and handed over to the BFPO service we have fulfilled our contract and delivery responsibility. All queries and problems with delivery must be taken up by yourself with BFPO and any claims must be handled between yourself and them.

VAT Exempt

If this applies to you, the price you will pay for the goods will automatically be adjusted to remove the VAT element - you MUST choose the correct country on checkout for this to apply. We CANNOT refund the VAT once the order is completed.

You can also avoid paying VAT if you are having your goods sent to you in the UK, but are taking the goods abroad permanently within 3 months of making the purchase. You will have to pay the VAT with your order but by following the steps outlined you can reclaim the VAT from us:

Request a VAT Reclaim form from us; give us a call or email immediately after ordering. We will complete the relevant parts of this form before sending it to you with your goods. You will then take the form with you and the goods when you leave the UK and you should ask customs to fill in their section of the form at the airport, ferry terminal or channel tunnel when you leave the country.

When you reach your destination outside the EU, you can then send the completed form back to us and we will refund the VAT amount charged to the credit or debit card details you have filled in on the reclaim form


We stock the vast majority of products listed on our website in our Whitley Bay superstore and warehouse and these products are available for same day dispatch & next day delivery.

Due to the huge quantity of products we stock, we offer the ability to backorder products which have gone out of stock and less popular products which we don't carry stock of.

Depending on the brand these backorder products can take anywhere between 1 and 10 days to arrive into stock. We estimate 3-5 working days on average but please be aware that products from some brands can take a little longer

As always if you aren't sure or want a more accurate estimate just give our team a call or email!


You can return any product that is in an UNOPENED, RE-SALEABLE condition within 30 days as long as it is not marked as clearance. Please contact us before doing this so we can confirm this ahead of time - we recommend using a recorded delivery service for any returns as you will be responsible for ensuring it reaches us.

Please get in touch to confirm a return by email or phone before sending anything back. When sending a return it is important that you include:

  • Your order number
  • Your name & a contact telephone number
  • The reason for return

We will try and get your return processed as quickly as possible but if you don't send this information it can delay the return.


If you have ordered something and it doesn't fit then we can exchange for a more suitable size, stock permitting, but you will have to pay the return postage.


Our customers have the right to cancel their orders within 14 days unless their order has been dispatched. After the order has been dispatched, it is the customers responsibility to return the item in a saleable condition and receieve either a full or partial refund.

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