Signature Protein 5LB by NutraBio

NutraBio Signature Protein 5LB is a multi-source protein powder delivering 25 grams of complete protein per scoop from milk protein isolate, micellar casein, and egg white protein. Each 5lb tub holds 63-65 servings at 130 calories and zero sugar per scoop, with a built-in digestive enzyme complex. Available in four flavors, it is third-party tested and made in the USA. If you're looking for an all-day protein for lean muscle and recovery, Signature Protein is built for it.

Want a smaller tub? NutraBio Signature Protein also comes in a 2lb tub with 25-26 servings.

Most protein powders give you one source and one speed. Whey hits fast and fades, casein trickles in slowly, and you end up picking one or buying both.

NutraBio has spent over 30 years building fully transparent supplements in its own GMP facility, and Signature Protein is its answer to the single-source shake. Three proteins absorb at three different rates, so your body gets amino acids right away and keeps getting them long after the shaker is rinsed. Every gram of every source is listed on the label - no proprietary blends, no guesswork - and flavors like Chocolate Milkshake and Cookies & Cream make it a shake you will actually look forward to.

Key Benefits

• 25g complete protein per scoop from three fully disclosed sources: 8.7g milk protein isolate, 8.2g micellar casein, 8.1g egg white protein
• Fast and sustained release - quick-absorbing protein for post-workout recovery plus slow-digesting casein that keeps amino acids flowing for hours
• 11g essential amino acids per serving, including 5.1g naturally occurring BCAAs and 2.25g leucine
• 130 calories, 0g sugar, 3g carbs per scoop
• Digestive enzyme complex (protease and lactase) to support comfortable digestion
• 30% daily value of calcium per serving to support bone health
• Third-party lab tested every lot, made in NutraBio's GMP-inspected facility in the USA, with no artificial dyes, no gluten, and no soy

What's in NutraBio Signature Protein

• Milk Protein Isolate (10.4g, 8.7g protein) - Contains both whey and casein fractions in their natural ratio, giving you fast-absorbing protein for immediate recovery and a slower portion for sustained delivery.
• Micellar Casein (10.4g, 8.2g protein) - The slowest-digesting dairy protein. It forms a gel in the stomach and releases amino acids gradually over several hours, which makes it ideal between meals or before bed.
• Egg White Protein (10.4g, 8.1g protein) - A highly digestible, complete protein rich in essential amino acids. It rounds out the amino acid profile and adds a third, medium-speed source to the blend.
• Digestive Enzyme Complex (250mg) - Protease helps break down protein and lactase helps break down milk sugar, so the shake sits light even on a full training day.
• MCT Powder (2g) - Medium chain triglycerides add a creamy, milkshake-style texture and a fast-used source of fat.

Signature Protein vs Whey Protein Isolate - Which Should You Choose?

• NutraBio Signature Protein - Choose it if you want one shake that works any time of day. The blend of fast and slow proteins covers post-workout recovery and keeps protein coming between meals, with a thicker, creamier texture.
• NutraBio Whey Protein Isolate - Choose it if you want the fastest-absorbing protein for right after training, with almost no fat or carbs and a wider range of flavors.
• NutraBio Micellar Casein - Choose it if you only want a slow-release protein for nighttime or long gaps between meals.

Who Is Signature Protein For?

• You train in the morning and want one shake that handles recovery and keeps protein coming until lunch.
• You want an easy way to hit your daily protein target between meals without reaching for a second product.
• You're an active adult focused on maintaining lean muscle and strength for the long haul.
• You want a protein that works before bed as well as after training, without keeping two tubs on the counter.
• You go through protein daily and want the larger 5lb tub so you restock less often.

Directions

Mix 1 scoop with 6-8 oz of cold water. Consume as needed to supplement your protein intake - after training, between meals, or before bed. For a thicker shake, blend with milk, ice, or a frozen banana. Contains milk and egg.

Not sure if Signature Protein is right for your goals? Call or text us at 908-452-5164 — our expert staff will help you find the perfect stack. Visit us in Hackettstown, NJ or shop online.

Frequently Asked Questions

How much protein is in NutraBio Signature Protein?

Each scoop delivers 25g of complete protein: 8.7g from milk protein isolate, 8.2g from micellar casein, and 8.1g from egg white protein. A serving has 130 calories and 0g sugar.

When should I take NutraBio Signature Protein?

Take it any time you need protein. The mix of fast-absorbing milk protein isolate and slow-digesting micellar casein works after training, between meals, or before bed.

Is NutraBio Signature Protein lactose free?

No. It contains milk and egg, so it is not suitable for anyone with a milk or egg allergy. It does include lactase and protease enzymes to support comfortable digestion.

How many servings are in NutraBio Signature Protein 5LB?

The 5lb tub has 63 to 65 servings depending on flavor, and one serving is one scoop. The 2lb tub has 25 to 26 servings.