Content Updated | January 23, 2026
Why do many people fail to see results even when training hard?
Have you ever given 100% in your workouts, but the results just don’t show?
Do you feel like you’re lacking energy, recovery, or muscle growth?
The answer might lie outside the gym — in your supplementation strategy.
But attention: supplements do not replace training, nutrition, or sleep.
They are precision tools that optimize what you already do well.
Based on evidence from the International Journal of Sport Nutrition and the International Society of Sports Nutrition (ISSN), this guide reveals:
Based on evidence from the International Society of Sports Nutrition (ISSN) , this guide reveals:
- Which supplements actually work
- How to use them safely
- Mistakes that sabotage your results
- Accessible natural alternatives
💡 Whey protein and creatine are the two most studied supplements — with proven effectiveness in over 500 scientific studies.
Have you ever felt like you’re giving your maximum effort in training, but still not seeing the expected results? Many people go through this, even when training with dedication. In these cases, understanding the role of sports supplements can make all the difference.
Training with dedication is fundamental, but it doesn’t guarantee results by itself. Many factors influence physical performance and body evolution, such as inadequate nutrition, insufficient recovery, training intensity, and lack of knowledge about complementary strategies.
It’s in this context that sports supplements come in as allies, helping to optimize the benefit from your workouts when used consciously and aligned with individual goals.
Following the right diet, but still not getting the results you’d like? Maybe you’re missing that “extra something” to boost your performance. Let’s understand together how sports supplements can be that extra push you’re looking for.
Why understanding sports supplements can improve your results
Supplements don’t replace training or nutrition, but they can optimize performance, recovery, and consistency when used correctly.
When I first set foot in a gym, I felt completely lost looking at those shelves full of colourful pots. “Do I need this? Does this really work? Where do I start?” I bet you’ve had these same doubts.
Sports supplements are like that friend who gives you a little push when you need it most. They don’t work miracles, but they can be the difference between stagnating and being able to progress towards your goals.
Whether it’s to gain muscle mass, improve performance, or speed up recovery, there’s a supplement that can help you.
In this article, I’ll explain everything about sports supplements in a simple and direct way, as if we were chatting at the gym. No complicated terms, no miraculous promises. Just practical information that will help you make smart choices.
What are sports supplements?
They are concentrated products that complement your diet, providing nutrients in strategic doses or moments that would be difficult to obtain from food alone.
🌿 Also discover: Pre and Post-Workout Nutrition — the foundation that makes supplements effective.
Sports supplements are products designed to complement your diet and provide extra nutrients that can be difficult to get from food alone, or that you need in larger amounts due to training.
It’s important to understand that they are exactly what the name says: supplements. This means they complement good nutrition, not replace it. Think of them as the cherry on top, not the whole cake.
The 6 sports supplements with scientific backing
There are several types of supplements available, each with a specific function. Let’s get to know the main ones:
Proteins: the building blocks of muscle
Proteins are like the bricks that form your muscles. When you train, you create small lesions in muscle fibres. Proteins help repair and strengthen these fibres.
Whey Protein
Whey protein is perhaps the most well-known supplement. It comes from milk and is quickly absorbed by the body. There are three main types:
- Whey Concentrate: Contains about 80% protein and some fat and lactose.
- Whey Isolate: Purer, with about 90% protein and less fat and lactose.
- Whey Hydrolysate: Already “pre-digested”, being absorbed even faster.
How to use: Ideally, take a dose (usually 30g) right after training, when your body is most receptive to nutrients. Just mix with water or milk.
Casein
Unlike whey, casein is absorbed slowly, releasing amino acids into the bloodstream for several hours. It’s great to use before bed, providing protein throughout the night.
Plant Proteins
If you don’t consume animal products, there are good plant protein options:
- Pea protein
- Rice protein
- Soy protein
They can be combined to get a complete amino acid profile.
Creatine: strength and power for your workouts
- No need for loading phase: 3–5g/day is sufficient
- Works by saturation: Results in 2–4 weeks
- Safe for healthy kidneys (WHO, 2025)
Creatine is one of the most studied supplements with proven effectiveness. It increases phosphocreatine stores in muscles, which improves energy production during intense exercise. Safe for healthy kidneys (WHO, 2020; NIH, 2022).
How to use: The traditional protocol involves a “loading” phase (20g per day for 5-7 days) followed by a maintenance phase (3-5g daily). Many experts today recommend just the maintenance phase, taking 3-5g every day, regardless of training day.
BCAAs: when they make sense and when they are unnecessary
BCAAs are three essential amino acids (leucine, isoleucine, and valine) that aid muscle recovery and reduce fatigue during exercise.
How to use: Can be consumed before, during, or after training. If you already consume plenty of protein in your diet, including whey protein, you may not need additional BCAA.
Glutamine: recovery and immune system
Glutamine is the most abundant amino acid in the human body and helps with muscle recovery and strengthening the immune system.
How to use: Usually taken after training or before bed, in doses of 5-10g.
Pre-workouts: energy and focus for training
Pre-workouts contain a mix of ingredients like caffeine, beta-alanine, citrulline malate, and other compounds that increase energy, mental focus, and blood flow to muscles.
How to use: Take about 30 minutes before training. Start with half a dose to test your tolerance, especially to caffeine.
Thermogenics: allies in fat burning
Thermogenics are supplements that help speed up metabolism and increase fat burning. They generally contain caffeine, green tea, pepper, and other ingredients.
How to use: Follow the manufacturer’s instructions and avoid taking them close to bedtime due to the stimulating effect.
How to build your supplementation strategy
⚠️ Important: This content is for informational purposes. It never replaces guidance from a sports nutritionist. Consult a professional before starting any supplement.
Assess your training level and current diet
The choice of the ideal supplement depends on your goals, type of training, and individual needs. Let’s see what works best for each case:
For muscle gain
If your goal is to gain muscle mass, focus on:
- Whey Protein: 20-30g right after training
- Creatine: 3-5g daily
- Carbohydrates: Maltodextrin or dextrose post-workout
- Casein: Before bed
For fat loss
If you want to lose weight:
- Whey Protein: Helps preserve muscle mass during caloric deficit
- Thermogenics: With caffeine and other ingredients that boost metabolism (use with caution)
- BCAA: Can help preserve muscle during fasted training
To improve performance
For athletes focused on performance:
- Beta-alanine: Improves endurance in high-intensity exercise
- Caffeine: Increases endurance and reduces perceived effort
- Creatine: Improves strength and power
- Carbohydrates: For long-duration activities
Supplements indicated according to each goal
| Goal | Recommended Supplements | Benefits |
|---|---|---|
| Muscle Gain | Whey Protein, Creatine, BCAAs, Glutamine | Increased protein synthesis, strength, and muscle recovery |
| Weight Loss | Thermogenics, Caffeine, L-Carnitine | Metabolism acceleration, increased energy, and aid in fat burning |
| Sports Performance | Creatine, Beta-Alanine, Caffeine | Improved strength, endurance, and mental focus |
| Recovery | Whey Protein, BCAAs, Glutamine, Carbohydrates (post-workout) | Nutrient replenishment, reduced delayed onset muscle soreness (DOMS), and immune system strengthening |
How to use sports supplements in training
The use of supplements during training varies according to the type of supplement and your goals. Let’s see how to use each one:
Before training (30-60 minutes before)
- Pre-workout (if you use it)
- Fast-digesting carbohydrates (if the workout is long or very intense)
- Caffeine (if not in pre-workout)
- Beta-alanine
During training
- BCAA (especially in long or fasted workouts)
- Isotonic drink (for workouts over 60 minutes)
- Carbohydrates (for endurance training)
After training (within 30 minutes)
- Whey protein
- Fast-absorbing carbohydrates
- Creatine
- Glutamine
Supplements and diet: an essential combination
It’s crucial to understand that supplements work best when combined with a balanced diet. They are the “cherry on top”, not the whole cake.
A good diet should include:
- Quality proteins (meats, eggs, dairy, legumes)
- Complex carbohydrates (brown rice, sweet potato, oats)
- Healthy fats (olive oil, avocado, nuts)
- Fruits and vegetables (for vitamins and minerals)
Supplements come in to fill specific gaps or provide nutrients at strategic moments, like right after training, when absorption is optimized.
Best Times to Consume Supplements
| Supplement | Best Time | Justification |
|---|---|---|
| Whey Protein | Post-workout (within 1 hour), upon waking, between meals | Fast absorption for muscle recovery and supply of essential amino acids |
| Creatine | Before or after training, or any time of day | Increases phosphocreatine levels in muscles, improving energy and strength |
| BCAAs | Before, during, or after training | Reduces muscle fatigue and aids recovery |
| Caffeine | 30-60 minutes before training | Stimulates the central nervous system, increasing alertness and focus |
| Thermogenics | In the morning or before training (avoid at night) | Speeds up metabolism and increases fat burning |
| Glutamine | Before bed or after training | Aids muscle recovery and strengthens the immune system |
Myths and truths about sports supplements
There are many myths about supplements. Let’s clarify some:
Myth: Supplements are anabolic steroids.
Truth: Most supplements are composed of natural nutrients that help performance and recovery, but do not have the same hormonal effects as anabolic steroids.
Myth: Supplements work miracles and replace food.
Truth: Supplements are a complement to the diet and do not replace balanced nutrition.
Myth: Supplements cause kidney problems.
Truth: In healthy people, supplements like whey protein and creatine do not cause kidney damage when used in recommended doses.
Myth: Creatine causes water retention and bloating.
Truth: Creatine can cause water retention inside muscle cells (which is good), but rarely causes visible bloating.
Myth: Excess protein turns into fat.
Truth: Excess calories turn into fat, regardless of the source. Protein even has a higher thermic effect (uses more energy to be digested).
According to the FDA and NIH, in healthy individuals, supplements like whey and creatine do not cause kidney damage when used at recommended doses .
Common mistakes that sabotage your results
- Using supplements without a solid dietary foundation
- Mixing multiple stimulants (coffee + pre-workout + thermogenic)
- Ignoring body signals (insomnia, anxiety, acne)
- Buying products without regulatory approval (e.g., FDA, ANVISA) or GMP certification
Natural supplements: options beyond industrialised ones
Not all supplements come in pots. Some natural foods have similar effects:
- Coffee: Natural source of caffeine
- Beetroot: Rich in nitrates, improves aerobic performance
- Ginger: Anti-inflammatory properties, aids recovery
- Turmeric: Potent natural anti-inflammatory
- Cinnamon: Helps control blood sugar
Comparison between industrialised supplements and natural alternatives:
| Supplement | Natural Alternative | Advantages of the Alternative | Disadvantages of the Alternative |
|---|---|---|---|
| Whey Protein | Eggs, chicken, fish | Additional nutrients, greater satiety | Longer preparation, slower digestion |
| Pre-workout | Coffee, green tea | Cheaper, fewer additives | Less precise dosage |
| BCAA | Meat, eggs, dairy | Complete nutritional profile | More calories, slower digestion |
| Creatine | Red meat, fish | Additional nutrients | Much smaller amount of creatine |
| Glutamine | Meats, eggs, dairy | Complete nutritional profile | Smaller amount of glutamine |
Side effects and precautions: what you need to know
Even the safest supplements can cause side effects in some people:
Whey Protein
- Possible digestive issues (especially in lactose intolerant individuals)
- Acne in predisposed people
Creatine
- Gastrointestinal discomfort (mainly during the loading phase)
- Intracellular water retention
Pre-workouts
- Anxiety, tremors, and insomnia (due to caffeine)
- Tingling (due to beta-alanine)
- Increased blood pressure
Thermogenics
- Increased heart rate
- Insomnia
- Nervousness
If you have any pre-existing medical condition, especially heart, kidney, or liver problems, consult a doctor before using any supplement.
Natural alternatives (when you want to avoid industrialised products)
- Coffee → replaces mild pre-workout
- Beetroot → improves aerobic performance
- Eggs + chicken → natural source of complete protein
- Coconut water + banana → post-workout electrolyte replenishment
How to build your personalised supplementation strategy
The best results come from:
- Consistent training
- Balanced diet
- Restorative sleep
- Strategic supplementation
To create a supplementation plan that works for you, follow these steps:
- Define your goals: Muscle gain, fat loss, performance, etc.
- Assess your current diet: Identify possible deficiencies.
- Consult a professional: A nutritionist can help personalise your plan.
- Start with the basics: Introduce one supplement at a time.
- Monitor results: Note how you feel and the results you observe.
- Adjust as needed: Not every supplement works equally for everyone.
Start with whey and creatine. Observe your body. Advance with awareness.
Also read:
Conclusion: Are sports supplements worth it?
Sports supplements can be great allies in your fitness journey, but they are not magic solutions. They work best when combined with consistent training, a balanced diet, and adequate rest.
Start with the basics (like whey protein and creatine) and, as you progress, experiment with other supplements specific to your goals. Always consult a professional before starting any supplementation.
And most importantly: listen to your body. What works for your friend may not work for you. Each organism is unique and responds differently to supplements.
As always, consult healthcare professionals and refer to evidence-based resources like Examine.com and PubMed before starting any supplementation.
Frequently Asked Questions about Sports Supplements
1. Can I take supplements without training?
Yes, but benefits will be limited. Without the training stimulus, there is no significant muscle gain.
2. Are supplements bad for the kidneys?
Not in healthy people, in recommended doses. Those with kidney disease should consult a doctor.
3. Can women use the same supplements as men?
Yes. Only the doses may vary by body weight — not by gender.
4. Do I need to do a creatine loading phase?
No. 3–5g daily saturates muscles in 3–4 weeks — without gastrointestinal discomfort.
5. Does whey protein cause acne?
It can worsen in predisposed people. In this case, try plant-based proteins.
References:
About me: I am Marcos Fonseca, a Chemistry and IT teacher for over 20 years — passionate about turning science into real practice. Here, you’ll find fact-based content, with no magical promises.
References
- International Society of Sports Nutrition (ISSN). Position Stand: protein and exercise. Journal of the International Society of Sports Nutrition, 2017. Available at: https://jissn.biomedcentral.com/articles/10.1186/s12970-017-0177-8
- International Society of Sports Nutrition (ISSN). Position Stand: creatine supplementation and exercise. Journal of the International Society of Sports Nutrition, 2021. Available at: https://jissn.biomedcentral.com/articles/10.1186/s12970-021-00412-w
- Examine.com. Comprehensive, evidence-based database on supplements and nutrition. Available at: https://examine.com/
- World Health Organization (WHO). WHO guidelines on physical activity and sedentary behaviour. Geneva: World Health Organization; 2020. Available at: https://www.who.int/publications/i/item/9789240015128
- U.S. Food & Drug Administration (FDA). Questions and Answers on Dietary Supplements. Available at: https://www.fda.gov/food/information-consumers-using-dietary-supplements/questions-and-answers-dietary-supplements
- National Institutes of Health (NIH) – Office of Dietary Supplements. Dietary Supplements for Exercise and Athletic Performance. Available at: https://ods.od.nih.gov/factsheets/ExerciseAndAthleticPerformance-HealthProfessional/
- PubMed Central (PMC). Searchable database of biomedical and life sciences literature. Available at: https://www.ncbi.nlm.nih.gov/pmc/
⚠️ Important: This content is for informational and educational purposes. It does not replace medical, nutritional, or psychological evaluation. In case of doubt, always consult a qualified professional. If this space serves you, feel at home to explore — and 👉 learn more about my journey.
