How to Build a Cutting Stack: An Evidence-Based Guide

Cutting — losing body fat while holding on to hard-earned muscle — is where supplement marketing gets loudest. Fat burners, "shredding matrices" and proprietary blends all promise to melt fat away. In reality, a fat-loss phase is won by a sustained calorie deficit, adequate protein and consistent resistance training. Supplements sit on top of that foundation, and only a handful are backed by solid research. Here is how to build a lean, no-nonsense cutting supplement stack around what the evidence actually supports.

What a cutting stack is really for

During a cut, the job of your supplements is narrow: help you hold on to muscle, support your training in a calorie deficit, and make sticking to lower calories a little easier. No pill or powder overrides energy balance — if you are not in a deficit, you will not lose fat, whatever the label claims. Keeping expectations realistic is the first step to spending your money well.

Protein: the non-negotiable base

If you only get one thing right, make it protein. The International Society of Sports Nutrition (ISSN) suggests around 1.4–2.0 g of protein per kg of body weight per day for most active people. During a calorie deficit, resistance-trained individuals often aim for the higher end — roughly 2.3–3.1 g/kg. Protein contributes to the growth and maintenance of muscle mass, which is exactly what you want to protect while you are dieting down.

Whole foods should lead, but a quality powder is a convenient way to top up. Whey concentrate, isolate and casein all do the job — brands like Optimum Nutrition, PhD, Warrior, Bulk and MyProtein are widely used and cost-effective per serving. Browse the options in our protein powders collection and pick one that fits your calories and taste.

Creatine: keep it in during a cut

Creatine monohydrate is the most researched sports supplement there is, and a cut is not the time to drop it. Creatine increases physical performance in successive bursts of short-term, high-intensity exercise — helpful for holding on to training quality when calories and energy are low. The authorised benefit is obtained with a daily intake of 3 g; in practice 3–5 g per day is a sensible amount, there is no need to "load," and monohydrate is as effective as pricier forms.

One point worth flagging: creatine draws a little water into the muscle, so the scale may not drop as fast in the first week or two. This is intracellular water, not fat gain, and it tends to settle. The evidence base also points to a strong long-term safety profile in healthy adults at normal doses. You will find trusted options from Applied Nutrition, Optimum Nutrition and Bulk in our creatine range.

Caffeine: the training-day lever

When calories and energy are low, caffeine can help you feel more switched on. Caffeine helps increase alertness and improve concentration — a benefit seen from around 75 mg — which can make a tough mid-cut session feel more manageable when motivation and fatigue are working against you.

Keep it sensible. The European Food Safety Authority considers up to 400 mg per day, and single doses up to 200 mg, unlikely to raise safety concerns for most healthy adults, with lower limits (around 200 mg per day) during pregnancy. Avoid stacking multiple caffeinated products at once, and keep late-day doses in check to protect your sleep. Pre-workouts from Grenade, Per4m and Applied Nutrition are convenient, but plain caffeine works too.

EAAs: what they are and when people use them

Essential amino acids (EAAs) are the nine amino acids the body cannot make and has to get from food. As a supplement they come as powders and capsules, and people typically use them to top up their amino acid intake around training or when reaching a protein target from food is difficult. They are situational rather than essential for everyone.

If your daily protein is already high from food and whey, there is little reason to add them. Where some people find them handy is around fasted morning training, or when appetite is suppressed and hitting protein targets is a struggle. If you do choose them, it is worth knowing the difference between the formats: a full EAA blend supplies all nine essential amino acids, whereas BCAAs supply just three of them (leucine, isoleucine and valine). Options from USN, NXT Nutrition, Mutant and Applied Nutrition sit in our EAAs & BCAAs collection.

What the evidence doesn't support

Most "fat burners" and thermogenic blends lean heavily on caffeine plus a list of ingredients — CLA, L-carnitine, raspberry ketones and similar — where the human evidence is weak, inconsistent or based on tiny effects. Proprietary blends also hide doses, so you rarely know what you are actually paying for. A better approach is to spend on the few things that are well supported, at effective doses, and put the rest of your budget into good food. No supplement out-trains a poor diet or an absent deficit.

The evidence

• ISSN position stand on protein and exercise — daily protein targets and higher intakes for retaining lean mass in a deficit.
• ISSN position stand on diets and body composition — protein, energy restriction and fat-free mass.
• ISSN position stand on creatine safety and efficacy — dosing, performance and safety.
• ISSN position stand on caffeine and exercise performance — effective doses and timing.
• EFSA scientific opinion on the safety of caffeine — general-population intake guidance.
• Westerterp-Plantenga review on dietary protein, satiety and weight loss — protein, fullness and energy balance.

Putting it together

A sensible, evidence-led cutting stack is simple: hit your protein target daily (food first, powder to top up), take 3–5 g of creatine monohydrate every day, use caffeine strategically before key sessions, and add EAAs only if they solve a specific problem for you. Get those basics consistent and you have covered almost everything a supplement stack can realistically do during a cut.

Ready to build yours? Start with the foundation in our protein powders collection and add creatine to match.

A quick note

This article is general information, not medical or nutritional advice. Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle, and should not be used to prevent or treat any illness. Always read the product label, do your own research, and speak to a qualified doctor, pharmacist or registered nutritionist before starting a new supplement — especially if you are pregnant, breastfeeding, under 18, taking medication or managing a health condition.