Partially hydrolyzed whey protein isolate (contains sialic acid 224 mg) and whey mineral concentrate. Contains milk (dairy) soy.

Other Ingredients - Unflavored- Soy lecithin; Chocolate - Coca processed with alkali, natural flavors, guar gum, sea salt, soy lecithin, thaumatin.

Mix 2 scoops (12.2 g) in 8 fl. oz. of liquid or add to food twice daily. For best results, take this product with 8 fl. oz. of liquid 20 minutes before breakfast and 20 minutes before dinner. Not formulated for use by children.

What are the key benefits of taking OsoLean?^††

• Excellent source of high-quality protein.
• You lose fat while maintaining lean muscle.*^‡
• Helps improve lean mass-to-fat ratio.*
• 10 grams of protein to help you feel full.*
• Good source of calcium.
• A natural source of leucine.
• Supports the body’s ability to protect against muscle loss associated with aging.*
• Helps fight cravings.*
• Source of branched-chain amino acids (BCAAs).
• Supports muscle growth and retention.*

What is OsoLean?

OsoLean is a scientifically tested whey protein supplement designed to support fat loss while helping to protect lean muscle when combined with the OsoLean plan, a reduced-calorie diet, and exercise.*^†† It provides high-quality protein, naturally occurring branched-chain amino acids (BCAAs), and sialic acid—a glycan† that supports cellular communication and metabolic health.*

What is the difference between OsoLean and OsoLean chocolate?

Both products feature the same science-backed formula and sialic acid glycan support.* The difference is in flavor preference:

• OsoLean (Unflavored): Designed for versatility—add it to smoothies, soups, or even your morning coffee.
• OsoLean Chocolate: Offers the same benefits with a smooth, cocoa flavor that can be enjoyed on its own, mixed with milk or water, or stirred into coffee or hot water for a comforting, chocolate-style beverage.

What are the key benefits of taking OsoLean?

• Supports fat loss while maintaining lean muscle mass when used with a healthy diet and exercise.*^††
• Helps improve lean mass-to-fat ratio.*
• Provides high-quality protein and calcium.
• Helps curb cravings and promote satiety.*
• Contains naturally occurring BCAAs, including leucine, to support muscle growth and recovery.*
• Features sialic acid, a glycan that supports cellular health and communication.^†
• Free from MSG, fillers, artificial flavors, colors,preservatives, and artificial sweeteners.

What makes OsoLean unique?

Unlike ordinary protein powders, OsoLean features a patented partially hydrolyzed whey protein isolate and whey mineral complex, which OsoLean also contains sialic acid, a  naturally occurring glycan^† that helps support cell-to-cell communication and metabolic processes.*

What is thaumatin and why is it used in OsoLean Chocolate?

Thaumatin is a natural, plant-based sweetener and flavor enhancer extracted from the Katemfe fruit (Thaumatococcus daniellii), native to West Africa. It’s a protein-based  ingredient that provides a pleasant, well-balanced sweetness without added sugar or artificial additives. Thaumatin allows OsoLean^® Chocolate to deliver a smooth cocoa flavor that complements the product’s clean-label and simple ingredients profile.

How should I take OsoLean?

For best results, mix 2 scoops of OsoLean powder in 8 fl. oz. of liquid or add to food twice daily, ideally 20 minutes before breakfast and 20 minutes before dinner.^‡

Serving Suggestions:

• Add to coffee or smoothies for a protein boost.
• Blend into oatmeal or baked goods to increase daily protein intake.
• Stir OsoLean Chocolate into hot water or warm milk for a rich, satisfying drink.

Can OsoLean be combined with other Mannatech products?^††

Yes. OsoLean pairs perfectly with TruHealth™ Shake or TruHealth™ Satiety Capsules for a comprehensive fat-loss and metabolic-support system.*

Who should take OsoLean?

OsoLean is ideal for adults seeking healthy fat loss, lean muscle preservation, or improved body composition.^†† It’s not formulated for children or pregnant/nursing women. Always consult a qualified healthcare professional before beginning any new supplement regimen.

Is OsoLean gluten-free and vegetarian-friendly?

Yes. Both OsoLean and OsoLean Chocolate are gluten-free, low glycemic, kosher, and suitable for vegetarians.

Are there scientific studies supporting OsoLean?

Yes. In an eight-week study, participants using OsoLean powder with a reduced-calorie diet and exercise experienced:

• Significant fat loss compared to diet alone.*
• Improved lean mass-to-fat ratio.*
• Decreased BMI and waist circumference.*

Can protein intake help support immune system?

Yes. Protein plays a key role in immune health, and research indicates that regular whey protein intake can help support a healthy immune system.*

Can I use OsoLean long term?

Absolutely. OsoLean supports sustainable wellness by promoting healthy metabolism, satiety, muscle, and cellular health—making it an excellent long-term addition to your
nutrition plan.*