Best Weight Gain Supplements & Protein Powders for Lean Mass in the UK (2025)

Best Weight Gain Supplements & Protein Powders for Lean Mass in the UK (2025)

For those struggling to gain weight, bulk up, or recover from intense training, a targeted approach to nutrition is essential. In 2025, weight gain supplements have evolved beyond just calories — now focusing on nutrient timing, clean ingredients, and muscle support.

Whether you’re underweight, in a muscle-building phase, or recovering post-illness, this guide covers the best protein powders and supportive nutrients to help you gain mass healthily and sustainably.

What Makes a Weight Gain Supplement Effective?

Effective weight gain supplements should combine:

• A calorie surplus (especially protein + complex carbs)
• Leucine-rich protein (triggers muscle protein synthesis)
• Digestive support for efficient nutrient uptake
• Adaptogens or metabolic activators (optional)

Macronutrient Targets:

• Protein: 1.6–2.2g/kg body weight (whey or vegan blends)
• Carbs: 4–6g/kg daily, ideally from oats, rice, or fruit powders
• Fats: ~20–30% of daily intake; include MCTs, flaxseed, etc.

Certified Nutrition’s Top Products for Healthy Weight Gain

1. Protein MAX+

• Includes whey protein, BCAAs, glutamine peptides, and creatine
• Formulated for serious bulking and recovery phases
• Electrolytes support hydration post-training

2. PureWhey Fusion

• High-purity whey isolate sourced from hormone-free UK dairy
• Flavored with stevia, ideal for clean bulking
• Fast digesting for post-workout recovery

3. PlantPro+ (Vanilla or Chocolate)

• Vegan protein blend with fibre, B-vitamins, and vitamin D
• Great for plant-based athletes and weight gain goals
• Balanced macros, suitable as a meal replacement

4. Pure Creatine

• Clinically validated for strength and lean mass gains
• Increases ATP production and power output
• Mixes easily with protein or pre-workouts

Research-Backed Support for Lean Mass Gain

– **Whey Protein**: Multiple RCTs confirm it promotes muscle protein synthesis and improves recovery when consumed within 2 hours post-exercise. (Morton et al., 2018)
– **Creatine Monohydrate**: Enhances lean body mass, strength, and cellular hydration — safe long term. (Kreider et al., 2017)
– **Vegan Protein + Leucine**: Can match whey for hypertrophy if leucine content is adequate. (Lim et al., 2021)
– **Digestive Enzymes + Fiber**: Aid absorption and reduce bloat — key for consistent nutrient intake.

When to Take Weight Gain Supplements

Safety & Quality Considerations

• Look for third-party testing (Certified Nutrition products are UK made)
• Avoid artificial sweeteners, fillers, or unnecessary gums
• Check for allergens: whey is dairy-derived; PlantPro+ is vegan and hypoallergenic

References

• Morton RW et al. “Protein supplementation and resistance training.” *Br J Sports Med*. 2018. Link (full PDF): https://bjsm.bmj.com/content/bjsports/52/6/376.full.pdf 
• Kreider RB et al. “Creatine supplementation and exercise.” *JISSN*. 2017. https://jissn.biomedcentral.com/articles/10.1186/s12970-017-0173-z
• Lim MT et al. “Vegan vs Whey Protein in Muscle Gains.” *Nutrition Reviews*. 2021. https://pmc.ncbi.nlm.nih.gov/articles/PMC7926405/

Browse More From Certified Nutrition

• All Protein Supplements →
• Fitness & Recovery Range →

← Back to Health Blog