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Amino Acid

Protein

Also known as: whey protein, plant protein, barley protein, rice protein

A
Evidence

Protein is a macronutrient composed of amino acids essential for building and repairing muscle tissue, supporting immune function, and maintaining overall body composition. It is obtained through diet or supplementation and is critical for athletes, active individuals, and general health maintenance.

Primary uses

  • Muscle building and recovery
  • Post-workout recovery
  • Muscle maintenance
  • Satiety and weight management
  • General nutritional support

How it works

  • Provides amino acids for muscle protein synthesis
  • Stimulates mTOR pathway for anabolic signaling
  • Supports enzyme and hormone production
  • Enhances satiety through metabolic effects

Dosage

Typical range
20-40 g per serving, 1-3 servings daily
Timing
Post-workout timing is most effective; can be consumed throughout the day
With food
Can be taken with or without food; post-workout absorption may be enhanced with carbohydrates
Duration
Can be used long-term as part of regular supplementation
Special populations
Requirements increase with age (65+ may need 1.2-1.6 g/kg body weight); individualize based on activity level and training goals

Forms

  • whey protein concentrate· 70/100
  • whey protein isolate· 70/100
  • plant-based blends· 70/100
  • barley protein· 70/100
  • rice protein· 70/100

Safety

Common side effects

  • Bloating or gas (particularly with plant-based proteins)
  • Digestive discomfort in sensitive individuals
  • Occasional constipation

Contraindications

  • Milk allergies (for whey/casein sources)
  • Severe kidney disease (consult healthcare provider)
  • Phenylketonuria (PKU) if containing phenylalanine

Evidence notes

Extensive RCT evidence demonstrates protein supplementation significantly supports muscle growth and recovery, particularly when combined with resistance training. Well-established macronutrient with decades of research.

Grade A: Multiple well-designed human trials support the main claims.

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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider.