Rule One R1 Clean Gainer is a mass gainer built to help you grow lean muscle and bounce back quickly after workouts. Gluten free [as a quick note] friendly for lactose intolerance, and free from artificial flavours, colours and sweeteners, this blend stays clean and simple. Supported by our commitment to quality, every batch strives to maximise anabolic signals with a balanced blend of protein, carbs and healthy fats.

Benefits & Features:

• Helps lean muscle growth as a mass gainer by sending a mix of fast and slow digesting proteins.
• A high carb blend helps refill glycogen so you can power through tougher workouts.
• Includes essential amino acids and BCAAs to help recovery after training.
• Post workout fuel arrives handy, helping you refuel.
• Daily amino acid delivery keeps repair steady, cuts soreness, supports training progression, and helps you stay consistent across tough weeks and multi-day cycles.

Rule One R1 Clean Gainer mixes a 30g protein blend (whey isolate, whey concentrate, micellar casein and milk proteins) with 97-99g of multi source carbohydrates and a lipid mix for energy. The formula delivers about 14g EAAs and over 6g BCAAs with 4g fibre, aimed at supporting lean mass gain and post workout recovery. It's gluten free, suitable for lactose intolerance, and free from artificial flavours, colours and sweeteners, with no amino spiking, a trusted mass gainer pick among protein shakes for muscle gain.

Calories, Total Fat, Saturated Fat, Trans Fat, Cholesterol, Sodium, Total Carbohydrate, Total Sugars, Includes Added Sugars, Dietary Fiber, Protein, Vitamin D, Calcium, Iron, Potassium

• GTIN: 196671003188
• Manufacturer: Rule One
• Size: Cookies & Creme - 4380 grams
• Categories: Rule OneWeight 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 two (2) scoops of R1 Clean Gainer with 14-16 oz. of water, milk, or your favourite beverage in a shaker cup or blender. For best results, consume after workouts or between meals, and combine with a calorie-rich diet and regular resistance training. Store in a cool, dry place, away from direct sunlight and moisture. Keep in original containers with lids tightly closed and out of reach of children. Food supplements must not be used as a substitute for a varied and balanced diet. If you are pregnant, breastfeeding, taking any prescribed medication, or have any medical condition, consult a healthcare professional before taking any supplements. Do not exceed the recommended daily dose.

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 protein gives you the building blocks for tissue repair and growth, supporting lean mass when combined with resistance training.

This form is dairy-derived and highly bioavailable, with whey protein isolate as a key component in a multi-source protein blend that also includes micellar casein and milk proteins.

What Does Protein (Whey Protein Isolate) Do?

Protein plays a role in muscle protein synthesis and helps maintain muscle mass after exercise, aligning with EFSA guidance on protein functions. It also supports recovery processes by supplying essential amino acids.

Dr. Jäger of the University of Stuttgart found that high-quality protein supports post-exercise muscle protein synthesis, contributing to lean mass gains when paired with appropriate training.

*This product is not intended to diagnose, treat, cure, or prevent any disease.

Rule One is Welzo’s reliable partner for lean-mass support, picked for its clear focus on clean, purposeful nutrition. This brand sticks out by delivering a mass gain shake that is gluten free, okay for lactose intolerance, and free of artificial flavours colours and sweeteners, in line with our simple, premium ingredient promise [our strict ingredient standards].

Rule One’s product framework emphasises a balanced nutrient profile designed to support muscle recovery and growth while keeping the formulation straightforward and transparent. Our team evaluated the brand’s approach to quality and safety, and Rule One consistently demonstrates a clear dedication to ingredient integrity and consumer trust, which we reinforce through our internal standards the standards we enforce.

This brand is particularly well suited to Rule One R1 Clean Gainer because its formulation aligns with our emphasis on purity and reliability in mass-gain products, making it a strong fit for the British market. Welzo’s medical team thoroughly reviewed the partnership for compliance with our rigorous criteria, and our endorsement reflects this collaborative diligence Welzo's healthcare professionals.