If you’re a skinny guy who has tried eating more, training harder, and still can’t seem to build the size and strength you’re working for — this bundle was put together specifically for you.

At Muscle Products Store, we know this journey personally. Our founder started at just 130lbs — naturally lean, fast metabolism, frustrated by the lack of progress despite real effort in the gym. After years of testing what actually works for hard-gainers, he built over 100lbs of lean muscle. This bundle is built on that experience.

Three products. Three problems solved. One complete system for skinny guys who are serious about finally building size.

The Bundle: What’s Included

Why These Three Products Work Together

Building muscle as a skinny guy comes down to three things that most beginners get wrong:

Not enough calories — your body cannot build muscle without a consistent calorie surplus. For fast metabolisms, achieving that through food alone is genuinely difficult.

Not enough anabolic support — your body needs to be in an optimal state to turn those calories into muscle rather than storing them as fat or burning through them.

Not enough recovery — muscle is not built in the gym. It is built while you sleep. Without deep, quality rest your body cannot repair and grow from your training no matter how hard you work.

This bundle addresses all three simultaneously — which is exactly why it works where individual products alone often fall short for skinny guys and hard-gainers.

Product 1: Mutant Mass Extreme 2500 — Your Calorie Foundation

The Fuel That Makes Everything Else Work

For skinny guys, the single biggest barrier to building muscle is not training — it is eating enough. Mutant Mass Extreme 2500 solves that problem directly and without compromise.

Each full serving delivers 1,070 calories, 30g of protein, and 231g of complex carbohydrates mixed with water — rising to an impressive 2,540 calories, 92g of protein, and 512g of carbohydrates when mixed with milk. For a hard-gainer who needs a significant daily calorie surplus to grow, this is one of the most effective calorie delivery systems available anywhere in the UK market.

What Makes the Formula Stand Out

Clean-Phase Carbo Blend — rather than relying on simple sugars for its carbohydrate content, Mutant Mass Extreme uses a sophisticated blend of Maltodextrin, Waxy Maize Starch, Barley Starch, Sweet Potato, and Rolled Oats. This multi-source approach delivers both fast-acting carbohydrates for immediate post-workout glycogen replenishment and slower-releasing sources for sustained energy — fuelling your muscles over time rather than producing a single spike and crash.

3-Whey Protein Multi-Phase Blend — the protein matrix combines Whey Protein Concentrate, Whey Protein Isolate, and Hydrolysed Whey Protein for fast, medium, and rapid absorption respectively. Your muscles receive amino acids both immediately after your shake and over the following hours — maximising the muscle protein synthesis window.

Lipid Foods Blend — the healthy fat sources include Fractionated Coconut (MCT) Oil, Avocado, and Pumpkin Seed. MCT oil provides fast-absorbing energy that supports training performance and hormonal health. Avocado and pumpkin seed contribute essential fatty acids that support hormone production — particularly important for skinny guys looking to optimise their anabolic environment.

Nutritional Breakdown

Per 4 scoops (285g) with water:

• Calories: 1,070
• Protein: 30g
• Carbohydrates: 231g (4g sugar — very low)
• Fat: 2.5g

Per 8 scoops (570g) with 1% milk:

• Calories: 2,540
• Protein: 92g
• Carbohydrates: 512g
• Fat: 14g

The remarkably low sugar content (just 4g per serving with water) despite the extreme carbohydrate volume reflects the quality of the Clean-Phase Carbo Blend — complex carbohydrates rather than cheap simple sugars.

How to Use Mutant Mass Extreme 2500

Post-workout — take one serving immediately after training to replenish glycogen stores, support muscle protein synthesis, and kickstart recovery.

Between meals or before bed — take a second serving between meals or in the evening to maintain your daily calorie surplus on both training and rest days.

Mixing tip: Start with water to keep calories at the labelled amount, or use 1% milk to significantly increase your daily calorie, protein, and calcium intake. For very fast metabolisms struggling to gain any weight, milk is the recommended option.

5.45kg tub — at this size, the tub provides an extended supply that supports consistent long-term bulking without needing to reorder frequently.

👉 Shop Mutant Mass Extreme 2500 5.45kg

Product 2: Applied Nutrition Turk X — Your Muscle Growth Amplifier

Turn Your Calories Into Muscle, Not Fat

Hitting a calorie surplus is the foundation. But for it to work, your body needs to be in an optimal state to partition those calories toward muscle growth rather than fat storage. This is exactly where Applied Nutrition Turk X comes in.

Turk X is built around Turkesterone — a natural plant-based ecdysteroid derived from Ajuga Turkestanica extract, standardised to 10% Turkesterone for consistent, reliable dosing. Turkesterone is considered the most effective ecdysteroid for supporting muscle growth, and it works through a fundamentally different mechanism to testosterone and traditional anabolic compounds.

How Turkesterone Works

Unlike testosterone, Turkesterone does not bind to androgen receptors. Instead, it supports muscle growth by stimulating different anabolic pathways — specifically enhancing muscle protein synthesis (the process by which your body builds new muscle tissue from protein). This means you get meaningful support for lean muscle development without any of the hormonal side effects associated with androgenic compounds such as hair loss, acne, or hormonal suppression.

For skinny guys, this is particularly valuable. The combination of Mutant Mass Extreme’s calorie surplus and Turk X’s protein synthesis support creates an environment where your body is both fuelled to grow and primed to build muscle efficiently.

AstraGin — Making Every Capsule Work Harder

Applied Nutrition have included AstraGin™ (Astragalus Membranaceus and Panax Notoginseng Extract) — the same patented absorption-enhancing complex found in their Critical Mass Professional formula. AstraGin has been clinically shown to improve the uptake of amino acids and other key nutrients, meaning the Turkesterone in each capsule is absorbed more efficiently and consistently.

Key Benefits for Skinny Guys

• Supports lean muscle growth through enhanced protein synthesis
• Non-androgenic — no testosterone-related side effects
• Pairs directly with a high-calorie diet to maximise muscle-to-fat ratio during bulking
• Natural and plant-based — no banned substances
• Enhanced absorption via AstraGin™ for consistent results

How to Use Applied Nutrition Turk X

Take 2 capsules per serving as directed on the label. Use daily for best results — Turkesterone works through consistent daily use rather than acute effects.

👉 Shop Applied Nutrition Turk X 60 Caps

Product 3: PER4M Sleep — Where Your Muscle Is Actually Built

The Most Overlooked Part of Building Size

Here is what most skinny guys get wrong: they focus everything on training and nutrition and completely neglect recovery. But muscle is not built during your workout. It is built during sleep — specifically during the deep, restorative sleep phases when growth hormone is released and muscle protein synthesis peaks.

Without quality sleep, your training stimulus and your calorie surplus cannot be converted into muscle effectively. PER4M Sleep ensures that every night becomes a genuine recovery and growth opportunity.

The Formula — Natural Sleep Science

PER4M Sleep is not a sedative or a sleeping pill. It is a carefully formulated natural sleep support stack designed for active people who need genuine, restorative rest. Each 4-capsule serving includes:

KSM-66® Ashwagandha Root Extract (standardised to 5% Withanolides) — the most clinically studied form of ashwagandha available. KSM-66® has been shown to reduce cortisol levels and stress response, supporting a calmer mental state before bed. For skinny guys, high cortisol is a genuine enemy of muscle growth — it promotes muscle breakdown and fat storage. Reducing it at night directly supports a more anabolic overnight environment.

L-Theanine (from Green Tea Extract) — a calming amino acid that promotes relaxation without drowsiness. Works synergistically with 5-HTP to quiet an overactive mind before sleep without leaving you feeling groggy in the morning.

5-HTP (5-Hydroxytryptophan) — a direct precursor to serotonin, which in turn supports melatonin production. Helps regulate your sleep-wake cycle naturally for consistent, quality sleep patterns.

L-Tryptophan — an essential amino acid that supports natural melatonin production and mood regulation. Works alongside 5-HTP to deepen the body’s natural preparation for sleep.

Tart Cherry Extract — a natural source of melatonin precursors and antioxidants. Supports natural sleep onset and has been studied for its role in reducing exercise-induced muscle soreness and inflammation — directly supporting recovery between training sessions.

Magnesium Bisglycinate — one of the most bioavailable forms of magnesium. Magnesium is critical for muscle relaxation, deep sleep quality, and testosterone production. Many active people are deficient in magnesium, making this a particularly impactful inclusion for gym-goers.

Zinc Monomethionine — supports hormonal balance including testosterone levels, immune function, and protein synthesis. Combined with magnesium, this is a classic and proven combination for overnight recovery support.

Valerian Root Extract (10:1) — traditionally used to improve sleep quality and reduce the time taken to fall asleep. Supports a calmer transition into deep sleep without morning grogginess.

Vitamin B6 (Pyridoxine Hydrochloride) — supports the conversion of L-Tryptophan and 5-HTP into serotonin and melatonin, making the other ingredients in the formula work more efficiently.

Why This Matters for Skinny Guys Specifically

Hard-gainers often have higher baseline cortisol levels and faster metabolisms — both of which can disrupt sleep quality and limit the overnight anabolic window. PER4M Sleep directly addresses this by reducing cortisol (KSM-66®), supporting natural melatonin production (5-HTP, L-Tryptophan, Tart Cherry), and optimising hormonal balance overnight (Magnesium, Zinc, B6).

The result is deeper sleep, better recovery, and a more anabolic overnight environment — meaning every session in the gym and every serving of Mutant Mass Extreme works harder for you.

How to Use PER4M Sleep

Take 4 capsules 30–60 minutes before bedtime. Use on both training days and rest days for consistent results. Particularly effective during intense training cycles when recovery demand is highest.

👉 Shop PER4M Sleep 120 Capsules

How the Bundle Works as a Complete System

This is not three random products thrown together. Each one addresses a specific stage of the muscle-building process for skinny guys:

Morning & between meals — Mutant Mass Extreme 2500 Provides the calorie surplus your fast metabolism demands. Without this foundation, nothing else works.

Daily — Applied Nutrition Turk X Supports muscle protein synthesis throughout the day, ensuring the calories from Mutant Mass Extreme are directed toward muscle growth.

Evening — PER4M Sleep Maximises the overnight recovery window where growth hormone is released and muscle is actually built. Reduces cortisol, supports hormonal balance, and ensures deep, restorative sleep.

Post-workout — Mutant Mass Extreme 2500 (second serving) Replenishes glycogen stores immediately after training and delivers protein for muscle repair at the most critical window of the day.

What Results Can You Expect?

Results depend on training consistency, overall diet, and individual metabolism — but based on experience helping thousands of UK customers, here is what most people following this system consistently report over 8–12 weeks:

• Consistent scale weight increase week on week
• Noticeable strength gains in the gym — weights that were challenging become manageable
• Improved muscle fullness and size, particularly in the chest, arms, and shoulders
• Better recovery between sessions — less soreness, more energy
• Improved sleep quality and morning energy from the first week of PER4M Sleep use
• More confidence in the gym as size and strength develop

The key word is consistency. This system works when you use it every single day alongside progressive training and a solid diet. Supplements without those foundations produce limited results — supplements combined with them produce the transformation you are after.

Complete Daily Schedule

Morning:

• 1–2 scoops of Mutant Mass Extreme 2500 with milk as a high-calorie breakfast addition or meal replacement

During the day:

• 2 capsules of Applied Nutrition Turk X with a meal

Post-workout:

• 4 scoops of Mutant Mass Extreme 2500 with milk for maximum recovery calories

30–60 minutes before bed:

• 4 capsules of PER4M Sleep to begin winding down and maximise overnight recovery

Frequently Asked Questions

Is this bundle suitable for complete beginners? Yes — all three products are suitable for beginners. Mutant Mass Extreme is straightforward to use, Turk X is simply two capsules daily, and PER4M Sleep is four capsules before bed. There is nothing complicated about this system.

Do I need to follow a specific diet with this bundle? You need to eat enough protein and calories throughout the day. Mutant Mass Extreme handles a significant portion of your calorie target — but eating three solid meals alongside your shakes will produce the best results. Aim for at least 1.6–2g of protein per kg of bodyweight daily in total.

How long should I use this bundle for? A minimum of 8–12 weeks for meaningful visible results. Muscle building takes time — this system works best when treated as a long-term commitment rather than a short-term experiment.

Is Turkesterone safe? Yes. Turkesterone is a natural plant-based compound with no known serious side effects. It does not affect androgen receptors, meaning it does not cause hormonal disruption, hair loss, or other side effects associated with anabolic steroids.

Can women use this bundle? Mutant Mass Extreme and PER4M Sleep are suitable for women. Applied Nutrition Turk X is also suitable for women — Turkesterone does not have androgenic effects. However, women looking to build lean muscle rather than maximum mass may prefer to use a half serving of Mutant Mass Extreme rather than a full serving.

What if I’m not gaining weight after a few weeks? First check your total daily calorie intake — are you consistently in a surplus above your maintenance level? If yes, try mixing Mutant Mass Extreme with full-fat milk instead of water to increase calorie intake further. If you are already doing this, consider adding an extra half serving between meals.

Will PER4M Sleep make me groggy in the morning? No. PER4M Sleep is formulated specifically to support natural, restorative sleep without a sedative effect. The L-Theanine and KSM-66® components promote relaxation rather than sedation — most users report waking feeling refreshed rather than heavy.

Why Buy This Bundle from Muscle Products Store?

• ✅ Fast UK delivery on every order
• ✅ All three products in stock and ready to ship
• ✅ Trusted by thousands of UK customers
• ✅ Expert advice from people who have been through this journey themselves
• ✅ Earn Muscle Points on every purchase — redeemable against future orders
• ✅ Buy now, pay later with Clearpay & Klarna 

Our founder went from 130lbs to 18 stone using the same principles behind this bundle. We stock these products because we believe in them — not because of marketing deals or brand relationships.

[👉 Shop The Ultimate Mass Building Bundle for Skinny Guys]

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All products featured in this bundle are stocked and available at Muscle Products Store with fast UK delivery. Muscle Products Store is an independent UK supplement retailer trusted by thousands of customers.