Rule One Casein Protein offers nightly muscle support by swapping to micellar casein to give a slow, gentle drip of amino acids, helping you maintain lean muscle while you sleep. Rule One is founded on quality and openness, delivering prolonged amino acid delivery via micellar casein to feed muscles while you sleep.

Benefits & Features:

• Promotes overnight muscle recovery.
• Each serving supplies twenty five grams of casein protein to feed muscles overnight.
• Prolonged amino acid delivery helps minimise overnight muscle breakdown and supports quicker recovery after evening workouts, giving you a more even morning and less sore muscles.
• Slow releasing micellar casein sits in your stomach longer, making this ideal for protein shakes and helping hit daily protein targets.
• Designed for day to day use and between meals, this best protein powder stands out for open ingredients and a simple formula, making it easy to fit into busy evenings and workouts.

Rule One's R1 Casein Protein uses micellar casein, the star ingredient for slow release overnight. Crafted to be clean and simple, it aligns with the brand's commitment to open ingredients and strict quality checks. The product is sourced with care to support steady amino acid supply while you rest, keeping you aligned with daily protein goals and easily fitting into a busy routine.

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: 196671004420
• Manufacturer: Rule One
• Size: Vanilla Creme - 1820 grams
• Categories: Casein ProteinLow-Carb Protein SupplementsRule One
• 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 heaping scoop of R1 Casein with 10-12 oz. of water, milk, or your favourite beverage in a shaker cup or glass. Shake or stir well to combine. For a smoother texture, use a blender. R1 Casein is best taken before bedtime or between meals to ensure a continuous supply of protein. Store in a cool, dry place away from direct sunlight. Keep out of reach of children. This product is not intended for individuals under 18 years of age. Consult a healthcare professional before use if you have any medical conditions or are taking any medications.

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: Casein Protein (Micellar Casein)

Casein protein, particularly micellar casein, is a dairy-based protein that gels in the stomach to deliver a slow, steady release of amino acids. It helps sustain a steady stream of amino acids for muscle tissue during fasting stretches.

This form is micellar casein, known for longer amino acid delivery and fit for night-time and between-meal use.

What Does Casein Protein Do?

Casein protein provides a slow, steady release of amino acids, supporting overnight muscle maintenance. This contributes to normal muscle protein balance and recovery, with research suggesting improved overnight protein synthesis when casein is consumed before sleep.

Dr. Res from the University of Nottingham found that casein ingestion before sleep boosts muscle protein synthesis. This product is not intended to diagnose, treat, cure or prevent any disease.

Rule One is Welzo’s chosen partner for R1 Casein Protein because its micellar casein blend is purposefully built for slow, steady amino acid delivery. This fits with Welzo’s focus on targeted, science‑backed supplements that help overnight muscle recovery and maintenance.

The brand’s approach to single-ingredient, fully disclosed protein sources mirrors our commitment to clarity and quality. We recognise Rule One for delivering a high-quality casein option that provides a steady amino acid release, which is ideal for night-time use or between meals. Our medical team reviews every brand in light of formulation integrity and user safety, ensuring we select partners that meet Welzo’s standards our medical team.

Welzo stock Rule One after thorough evaluation, highlighting how we verify ingredient quality and manufacturing practices how we verify ingredient quality. This brand stands out through its specialised focus on micellar casein and its suitability for extended amino acid delivery, providing clear value and confidence for customers seeking overnight protein support.