Walk into any gym and you'll hear people talk about their "stack". It sounds complicated, but a supplement stack is simply a set of products you take together because they cover different jobs. Done well, a stack saves money and avoids waste. Done badly, it doubles up on the same ingredients and leaves gaps where it matters.
This guide shows you how to stack supplements properly: the foundation products almost everyone can benefit from, how to build on them for your goal, when to take what, and which ingredients you should never double up on.
What is a supplement stack?
A supplement stack is two or more supplements chosen to work alongside each other. The best stacks follow three simple rules:
- Each product has a clear job. Protein for protein intake, creatine for performance, a pre-workout for training energy. If two products do the same job, one of them is probably wasted money.
- Nothing is doubled up by accident. Caffeine, zinc, vitamin D, B6 and ashwagandha turn up in more products than you'd expect.
- Diet, training and sleep come first. Supplements fill gaps. They can't replace a varied diet and healthy lifestyle.
Step 1: Build the foundation
Before you think about fat burners or test boosters, get the basics in place. These are the products with the most research behind them and the widest use, whatever your goal.
Protein powder
Protein contributes to the growth and maintenance of muscle mass. Most people who train benefit from more protein than they currently eat, and a shake is the easiest way to close the gap. Not sure how much you need? Read How Much Protein Do You Actually Need Per Day?
- Best value: a whey blend such as Per4m Whey
- Cutting or lactose-sensitive: a whey isolate such as Per4m Isolate
- Dairy-free: browse vegan protein
Creatine monohydrate
Creatine is the most researched sports supplement there is. Creatine increases physical performance in successive bursts of short-term, high-intensity exercise, with the beneficial effect obtained from a daily intake of 3g. Take 3–5g every day, at any time. There's no need to load or cycle it. Insight Creatine Monohydrate gives you 50 servings of 5g. For the full breakdown, see Creatine: The Complete Buying & Usage Guide.
Vitamin D
In the UK, the NHS advises everyone to consider a daily vitamin D supplement in autumn and winter, when sunlight isn't strong enough for your body to make enough. Vitamin D contributes to the maintenance of normal bones and muscle function. Insight Vitamin D3 + K2 pairs D3 with vitamin K2, which contributes to the maintenance of normal bones.
Omega-3
If you don't eat oily fish twice a week, an omega-3 is worth adding. EPA and DHA contribute to the normal function of the heart, with a daily intake of 250mg. Insight Omega High Strength gives you 500mg EPA and 250mg DHA in one softgel.
Magnesium
Magnesium contributes to the reduction of tiredness and fatigue and to normal muscle function. Glycinate forms are gentle on the stomach and easy to take in the evening. Try Insight Magnesium Glycinate.
Step 2: Add products for your goal
Once the foundation is covered, add one or two products that match what you're training for. Here are four common goal stacks.
Muscle building stack
- Protein powder
- Creatine monohydrate
- A pre-workout for harder sessions (see our Complete Pre-Workout Guide)
- A mass gainer only if you genuinely struggle to eat enough
Cutting stack
- Whey isolate or clear whey, which are lower in calories per gram of protein
- Creatine, which you should keep taking during a diet
- EAAs if you train fasted (see EAAs vs BCAAs)
- An optional fat burner, but only if it doesn't double your caffeine (more on this below)
Endurance and hybrid stack
- Electrolytes for long or sweaty sessions (read Do You Need Electrolytes?)
- Intra-workout carbs for sessions over 60–90 minutes
- Creatine and protein for strength work and recovery
Everyday health stack
- A good multivitamin (read What to Look for in a Multivitamin)
- Vitamin D and omega-3
- Magnesium in the evening
- A greens powder if your diet is light on fruit and veg
Step 3: Get the timing right
Timing matters less than taking things consistently, but a simple routine makes a stack easier to stick to.
- Morning, with breakfast: multivitamin, vitamin D3 + K2 and omega-3. Fat-soluble vitamins are best taken with food.
- 20–30 minutes before training: pre-workout.
- During training: EAAs, electrolytes or intra-workout carbs.
- After training, or any time: protein shake and creatine.
- Evening: magnesium, and sleep or wind-down products.
Creatine works by building up in your muscles over time, so the best time to take it is whenever you'll remember. Plenty of people simply add it to their protein shake.
Step 4: Check for overlaps
This is where most stacks go wrong. Many products share ingredients, and the totals add up quickly.
- Caffeine. Pre-workouts, fat burners, energy drinks and some nootropics all contain it. EFSA considers up to 400mg a day safe for healthy adults (not pregnant women), with single doses up to 200mg. A high-stim pre and a stim fat burner on the same day can easily go over that.
- Zinc. Found in multivitamins, ZMA products, men's health formulas and some sleep products. Avoid taking more than 25mg a day from supplements unless advised.
- Vitamin D. If your multivitamin already contains vitamin D, check the total before adding a high-strength D3.
- Vitamin B6. Common in sleep, energy and multivitamin products. Long-term intakes above 10mg a day from supplements are not recommended in the UK unless advised by a doctor.
- Ashwagandha. Turns up in sleep, stress, men's health and even some pre-workouts. Pick one product that contains it, not three.
- Beta-alanine and citrulline. If your pre-workout already contains a full dose, a separate pump product doesn't need to add more.
A quick check: write down every product you take and the amounts of these six ingredients. If any total looks high, drop a product.
Example stacks
Starter stack (about £1 a day)
- Whey protein
- Creatine monohydrate
- Vitamin D3 in autumn and winter
Serious lifter stack
- Whey protein and creatine
- A daily driver pre-workout from our Daily Driver range
- Vitamin D3 + K2, omega-3 and magnesium glycinate
Health-first stack
- Multivitamin, vitamin D3 + K2 and omega-3
- Magnesium glycinate in the evening
- A greens powder such as Per4m Greens
Common stacking mistakes
- Starting everything at once. Add one new product at a time, a week or two apart. If something doesn't agree with you, you'll know which one it is.
- Buying the exotic before the basics. Protein, creatine and vitamin D do more for most people than any "advanced" formula.
- Ignoring labels. Proprietary blends hide doses, which makes overlaps impossible to check. Choose fully disclosed labels.
- Stacking stimulants. Count every source of caffeine.
- Forgetting medication. If you take any medication or have a medical condition, speak to your GP or pharmacist before starting a new supplement.
FAQs
Can I take creatine and protein together?
Yes. Mixing creatine into your protein shake is one of the easiest ways to make sure you take it every day.
Can I take a pre-workout and a fat burner together?
Only if you've checked the total caffeine. Most stim fat burners contain 150–300mg, so pairing one with a stim pre-workout often takes you well over 400mg. Use a non-stim pre-workout or a stim-free fat burner instead.
How many supplements is too many?
There's no magic number, but if you can't say what each product is for, you probably have too many. Most people do well with three to six.
Do I need to cycle supplements?
Creatine, protein, vitamins and minerals don't need cycling. Stimulants are different: taking regular breaks from caffeine helps keep its effects noticeable.
Build your stack
Start with the foundation, add one product for your goal, and check for overlaps. That's all a good supplement stack is. If you want help choosing, browse our Insight range or get in touch and we'll point you in the right direction.
Food supplements should not replace a varied diet and healthy lifestyle. If you are pregnant, breastfeeding, taking medication or have a medical condition, speak to your GP before use.