Rule One Source7 Protein is a mixed source protein powder that delivers quick and steady amino acid release to support muscle growth, recovery, and fullness. The blend contains whey isolate, whey concentrate, hydrolysed whey, native whey, micellar casein, milk protein isolate and pea protein to cover fast boosts and long lasting nourishment. Rule One champions quality and transparency, delivering premium ingredients with strict testing to help athletes train with confidence.

Benefits & Features:

• Fast and slow amino acids drive steady recovery.
• Protein shakes made easier after training.
• Star ingredient blend, featuring whey isolates, hydrolysed whey, micellar casein, and pea protein, delivers fast acting amino acids after workouts with a slow release to support daily anabolic balance.
• Over 10g EAAs per serving supports repair.
• Informed Choice certified and regularly tested for banned substances, making it a top choice as the best protein powder for athletes pursuing muscle gain.

Source7 Protein brings together seven protein sources - whey isolates, whey concentrate, hydrolysed whey, native whey, micellar casein, milk protein isolate and pea protein - for a complete amino acid profile. The blend aims for quick amino acids after training and a steady supply for longer recovery and appetite control. It carries the Informed Choice badge, reflecting regular testing for banned substances and strict quality checks. Athletes who value transparency and real results often choose it as a solid option for protein shakes and protein powder 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: 196671005069
• Manufacturer: Rule One
• Size: 897 grams / Vanilla
• Categories: Low-Carb Protein SupplementsProtein Powders, Shakes & 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 scoop of Source7 Protein with 6-8 oz. of cold water in a shaker or with a spoon in a glass. For a creamier shake, blend with your favourite milk and a few ice cubes. Source7 Protein can be taken anytime throughout the day, whether in the morning, noon, or night, and is suitable for use as a post-workout recovery, a mid-day snack, or a meal replacement. Store in a cool, dry place away from direct sunlight. Keep out of reach of children. Consult a healthcare professional before use if you are pregnant, nursing, or have any medical conditions.

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 Core Ingredient Is: Whey Protein (Multi-Source Blend)

Whey protein is a solid protein source that provides essential amino acids needed for normal bodily functions and muscle maintenance.

This formula blends fast- and slow-digesting proteins, helping to supply a steady stream of amino acids from whey isolates, hydrolyzed whey, micellar casein, and plant protein to help support everyday vitality.

What Does Whey Protein Do?

Whey protein helps the normal process of muscle protein synthesis after exercise, helping to maintain and repair muscle tissue as part of a balanced diet. It also contributes to feelings of fullness after meals, supporting daily energy balance.

Scientific research suggests post-exercise protein intake can stimulate anabolic processes, contributing to muscle recovery and satiety. This aligns with EFSA-style guidance on high-quality protein consumption and normal bodily functions. Dr. Morton of the University of Leeds found that protein intake after exercise helps to support muscle protein synthesis.

This product isn’t intended to diagnose, treat, cure, or prevent any disease.

Rule One is Welzo’s trusted partner for Source7 Protein thanks to a long-standing commitment to quality and performance. The brand’s track record in delivering premium multi‑source protein blends, backed by Informed Choice certified testing through the LGC lab, demonstrates their dedication to substance-free, reliably tested products that athletes can trust. This level of certification signals a rigorous quality management approach and continuous verification of ingredients, which aligns with Welzo’s emphasis on safety and transparency.

Rule One’s quality philosophy focuses on premium formulation and dependable manufacturing standards, making Source7 Protein a strong fit for this category. Our medical team evaluated this brand against competitors using Welzo’s criteria for credibility, certification, and manufacturing integrity, and their demonstrated diligence stood out. You can learn more about how we verify ingredient quality through our process and team at Welzo.

Choosing Rule One for Source7 Protein translates into clear customer benefits: consistent product quality, rigorous testing, and a trusted partner approach that mirrors Welzo’s own standards. This is why we recommend Rule One as our go‑to brand for this supplement. Welzo's healthcare professionals and how we verify ingredient quality.