Reflex One Stop Xtreme is built around a multi protein blend that quickly and easily delivers amino acids for muscle growth and recovery. This creatine boost supports strength and power, while a low GI carb matrix keeps energy steady. The enzymes and probiotics support digestion and nutrient uptake, while the grass fed whey and halal certification underline quality. While collagen peptides are popular elsewhere, this formula sticks with a robust whey and micellar casein base.

Available Sizes & Variants:

2030 grams mass gainer - large tub for daily use

Benefits & Features:

• Delivers high protein to support lean muscle growth.
• Creatine boost supports strength and power, while a low GI carb matrix keeps energy steady.
• Carbohydrate matrix supports glycogen replenishment while keeping fat gain minimal, making it easy to add to protein shakes.
• Enzymes and probiotics support digestion and nutrient uptake, while the grass fed whey and halal certification underline quality.
• Reflex Nutrition is known for lab tested protein content and GMP manufacturing, plus halal certification and grass fed whey, which means you're choosing a trusted, clean option.

Reflex Nutrition One Stop Xtreme is built around a multi protein blend that quickly and easily delivers amino acids for muscle growth and recovery. Creapure creatine aids strength and power, while a low GI carb matrix keeps energy steady. Enzymes and probiotics support digestion and nutrient uptake, while the grass fed whey and halal certification underline quality. While collagen peptides are popular elsewhere, this formula sticks with a robust whey and micellar casein base.

Energy, Fat, of which saturates, Monounsaturates, Polyunsaturates, Carbohydrate, of which sugars, Fibre, Protein, Salt, Vitamin A, Vitamin D3, Vitamin C, Thiamin, Riboflavin, Niacin, Vitamin B6, Folic Acid, Vitamin B12, Biotin, Panthothenic Acid, Magnesium, Iron, Zinc, Copper, Selenium, Chromium, Amino Acids:, Branched-Chain Amino Acids (BCAAs), of which Free Form L-Leucine, Glutamine Peptides, Creapure Creatine Monohydrate, Betaine Anhydrous, Beta Alanine, L-Taurine, Vitamin Like Substances:, Choline, DeltaGold Tocotrienols, Digestion, DigeZyme Digestive Enzyme Complex, Bioperine Piperine, Bifidobacterium bifidum 725000000 CFU, Lactocacillus acidophilus 725, 000, 000 CFU, Lactobacillus rhamnosus 725, 000, 000 CFU, Energy, Fat, of which saturates, Monounsaturates, Polyunsaturates, Carbohydrate, of which sugars, Fibre, Protein, Salt, Vitamin A, Vitamin D3, Vitamin C, Thiamin, Riboflavin, Niacin, Vitamin B6, Folic Acid, Vitamin B12, Biotin, Panthothenic Acid, Magnesium, Iron, Zinc, Copper, Selenium, Chromium, Amino Acids:, Branched-Chain Amino Acids (BCAAs), of which Free Form L-Leucine, Glutamine Peptides, Creapure Creatine Monohydrate, Betaine Anhydrous, Beta Alanine, L-Taurine, Vitamin Like Substances:, Choline, DeltaGold Tocotrienols, Digestion, DigeZyme Digestive Enzyme Complex, Bioperine Piperine, Bifidobacterium bifidum 725000000 CFU, Lactocacillus acidophilus 725, 000, 000 CFU, Lactobacillus rhamnosus 725, 000, 000 CFU

• GTIN: 5033579013114
• Manufacturer: Reflex Nutrition
• Categories: Best SellersReflex NutritionSubscribe & Save ProductsWeight Gainers & Muscle Mass Gainers
• Best buy: 6 - 24 months+

United Kingdom Shipping:

Orders placed by 2pm (Monday to Friday) are dispatched the same day. Orders placed after 2pm will be dispatched the next working day.

Free shipping on orders over £50 to the UK.

Returns: Our products are meant to make you feel healthy and at your best. If you need to return your item, you can do so free of charge within 30 days in the same original and unopened packaging. Subject to T&C's.

Mix one serving (145g) with 600ml of water in a shaker or blender. It is recommended to take two servings per day: one mid-morning between meals and one after a workout on training days, or one mid-morning and one in the afternoon on non-training days. Store in a cool, dry place, away from direct sunlight and moisture. Keep out of reach of children. This product is not intended for use by those under the age of 16. Do not exceed the recommended daily dose. If you are pregnant, breastfeeding, taking any prescribed medication, or have any medical condition, consult a healthcare professional before use.

Please consult the product packaging for accurate instructions on how to use the product.

*Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

The Active Ingredient Is: Creatine Monohydrate

Creatine monohydrate is a natural compound stored in muscle and used to rapidly supply energy during brief bursts of intense activity.

This form is often produced as a very pure supplement, including branded Creapure variants, and is designed to boost high‑intensity performance and energy metabolism in muscles.

What Does Creatine Monohydrate Do?

Creatine monohydrate helps with quick energy replenishment in your muscles, helping improvements in strength and power gains during short, intense bursts, which aligns with sports nutrition literature guidance.

Dr. Kreider of Baylor University discovered that creatine supplementation can boost muscle strength and power in adults doing resistance training.

This supplement isn't meant to diagnose, treat, cure, or prevent any disease.

Reflex Nutrition One Stop Xtreme stands out for its well established reputation in the sports nutrition scene and its strong commitment to quality and transparency. This brand is recognised for rigorous independent lab testing and for manufacturing to high standards, including Informed-Sport registration and GMP-compliant facilities, with Halal certification and traceable ingredients. These factors underpin Reflex’s credibility as a trusted partner in our premium supplement programme.

Welzo checked Reflex against our standard vetting criteria, including manufacturing integrity, ingredient sourcing, and performance verification. Our team weighs certifications, testing protocols, and supplier transparency to keep safety and consistency for athletes and active folks. We trust Reflex because they prioritise clean nutrition (grass-fed dairy and non-GMO ingredients, no hormones) and it's aligned with our quality and purity standards, which you can review through our ingredient quality and purity standards.

This brand’s proven approach to multi‑component formulas and reliable protein blends makes One Stop Xtreme a natural fit for its targeted performance support, backed by our medical experts and rigorous product evaluation. Learn more about our team of medical experts via our team of medical experts.