Whey proteins

Meet whey proteins: A guide from isolate to hydrolysate

What are whey proteins?

Whey proteins are among the most thoroughly researched sports nutrition supplements. They are naturally rich in essential amino acids, especially leucine, which is the primary trigger for the mTOR signalling pathway responsible for starting muscle protein synthesis (MPS) – the process through which muscle growth and recovery occur.

Whether you are a beginner looking to improve post-workout recovery, or a professional athlete dealing with precise nutrient timing, whey protein offers a practical, fast-absorbing and highly biologically valuable solution.

How whey protein is made

Whey is produced as a by-product of cheese making. Milk contains approximately 20% whey proteins and 80% casein. After the whey is separated, gentle filtration processes follow (e.g. microfiltration or ultrafiltration), which concentrate the protein content.

The result is various types of whey proteins, which differ in:

• protein content
• amount of lactose and fat
• speed of digestion and absorption
• price and suitability for a specific goal

Processing technology affects not only the composition, but also the bioavailability of amino acids.

Which type of whey protein should you choose?

Choosing the right type of whey protein should match your training goals, digestive tolerance and budget.

1. Whey protein concentrate (WPC)

Whey protein concentrate is the most widespread form, produced using ultrafiltration.

• Protein content: Usually 70–80%.
• Natural lactose and fat content
• Benefits: Retains beneficial immunoglobulins and lactoferrin, which support the immune system. Best value for money
• Use: Ideal as a universal dietary supplement during the day or after training for recreational athletes.

WPC is suitable for most recreational athletes as well as advanced users who do not have issues digesting lactose. It retains more bioactive fractions (e.g. immunoglobulins, lactoferrin).

2. Whey protein isolate (WPI)

If you are focusing on maximum purity, whey protein isolate is the clear choice. Thanks to Cross-Flow Microfiltration (CFM), it is almost completely stripped of lactose and fat.

• Protein content: >80–90%
• Very low lactose content (often trace amounts)
• Minimal fat content → suitable for weight loss and sensitive digestion
• Key benefit: Minimal calorie intake, which you will especially appreciate during cutting, and very low lactose content (very often suitable for people with lactose intolerance).

Thanks to its higher purity, whey protein isolate is suitable during a weight-loss diet or for people with mild lactose intolerance. Amino acid absorption is fast, which is particularly beneficial after training.

Tip: In recent times, so-called clear proteins have also become increasingly common. In most cases these can be classified as whey protein isolate, but they are technologically modified so that they have a light, "juicy" consistency and a fresh taste instead of the classic milkshake. From a nutritional point of view, however, they usually do not differ from other isolates – the difference lies mainly in the taste and consistency.

3. Whey protein hydrolysate (WPH)

Whey protein hydrolysate represents something of a technological peak. It undergoes enzymatic cleavage (hydrolysis), which "pre-digests" the complex protein molecule into smaller particles (peptides), which can speed up amino acid absorption.

• Absorption speed: Very high – it causes a sharp rise in blood amino acid levels.
• Use: Professional athletes use it for immediate recovery after extremely demanding performance. The DH label (degree of hydrolysis) indicates the level of cleavage; for example, DH32 is the fastest-absorbing form.
• Higher price, often poorer taste.

Some studies suggest a faster increase in blood amino acid levels compared with concentrate, but the practical difference is relevant mainly for top-level athletes.

Reading tip: How do you choose a protein?

Be wary of marketing labels such as "100% Whey Protein Professional" – this number usually does not mean that the product contains 100 g of protein per 100 g of powder. It is often just the product name or information that the pack contains 100% protein powder (without additions such as creatine, etc.), not that the powder itself consists of 100% pure protein – always check the actual content in the nutrition table.

What about grass-fed whey protein or organic protein?

With some products you will come across the label "grass-fed whey protein" (whey from the milk of cows fed mainly on grass). In practice, this often means an emphasis on the origin of the raw material and the farming method – in other words, a "cleaner" story and, for some customers, a more ethical choice.

However, it is important to point out a fundamental fact: within current EU legislation there is no fixed rule or control mechanism for the label "grass-fed". Unlike organic certification, this label is not subject to any specific official verification, and therefore in many cases it is primarily a marketing tool without independent control of the actual proportion of grass in the feed.

From a nutritional perspective, however, an important rule applies: for muscle growth and recovery, the main deciding factors are still the total protein content, the quality of EAA and enough leucine in one serving. So if you are choosing between two quality proteins, grass-fed whey protein can be a pleasant bonus (origin, transparency, preference), but it is not a magical property that on its own guarantees better results in the gym.

The same applies to organic proteins – this is simply a label indicating that the raw material comes from organic farming meeting certification requirements, not an automatic guarantee of a higher protein content or a better amino acid profile.

Comparison table of parameters

Dosage and timing based on scientific evidence

For maximum stimulation of protein synthesis (i.e. the process by which muscles are built from ingested protein), a dose of 1.6–2.2 g/kg/day appears optimal, depending on training intensity.

The scientific recommendation for one serving is then 0.25–0.4 g of protein/kg body weight, which usually works out at 20–40 g of protein per serving.

• After training: Consuming whey protein in this time window increases the body's anabolic response.
• During the day: Helps maintain a positive nitrogen balance, which prevents catabolism (muscle breakdown).
• In the kitchen: Thanks to its heat stability, you can add whey protein to porridge or fitness recipes to increase their nutritional value.

Expert tip: Whey increases glutathione levels, the body's most powerful antioxidant, thereby actively helping to fight oxidative stress after demanding physical performance.

Why are whey proteins so effective?

1. High leucine content

Leucine is the main trigger for activation of the mTOR signalling pathway – a key mechanism for muscle growth. The optimal dose to stimulate MPS is approximately 2–3 g of leucine per serving, which corresponds to around 20–30 g of quality whey protein.

2. Fast digestibility

Whey protein belongs to the so-called "fast proteins". This means that amino acids enter the bloodstream faster than, for example, in the case of casein.

3. Support for strength and muscle mass

The meta-analysis of 49 studies by Morton et al. (2018) confirmed that protein supplementation combined with strength training significantly increases muscle mass as well as strength.

In which situations are whey proteins suitable?

Building and maintaining muscle mass

• making it easier to meet your daily protein intake
• supporting post-workout recovery
• suitable for beginners and advanced users alike

Weight loss and body shaping

• a higher protein intake helps protect muscle mass during weight loss (i.e. during a calorie deficit)
• may improve satiety and adherence to the diet

Tip: Read our basic tips and rules to help you lose weight

Endurance and periods of high load

• help with recovery, especially if you do not have time for a proper meal after performance

Healthy lifestyle and recovery

• if a person has a long-term low protein intake from food
• as a "guarantee" of protein throughout the day

In the kitchen

• porridge, yoghurts, smoothies, baking – an easy way to increase protein intake without complicated cooking

How to recognise a high-quality whey protein

When choosing, do not look only at the big "protein %" number. The context is more important:

• How much protein is in one serving (actually in grams)
• How much leucine / EAA is in a serving (if the manufacturer lists amino acids)
• Added amino acids
• Digestibility: if dairy products do not suit you, choose WPI or WPH
• Composition of sweeteners and flavours: for sensitive digestion, the difference between "suits me/does not suit me" can be precisely in the flavours and sweeteners (not necessarily in the protein itself)

How to use whey protein

• Mix with water or milk
• Add to porridge
• Use in a smoothie
• Add to baking (protein desserts)
• Unflavoured variants can also be used in savoury dishes

Safety and contraindications

In healthy individuals, studies have not linked higher protein intake to impaired kidney function; the risk mainly concerns people with existing kidney disease, where it is advisable to consult a doctor. However, it is important to:

• maintain an overall balanced diet
• keep hydrated
• in the case of kidney disease / specific diagnoses, address protein intake individually with a specialist

Whey proteins are considered safe for long-term use at the recommended doses.

Summary

Whey proteins are one of the most effective and practical ways to supply high-quality protein, support protein synthesis and speed up recovery. If you are looking for a universal option, start with WPC. If you are managing protein/calorie intake and digestion, choose WPI. And if you are undergoing extreme strain and want maximum speed, WPH makes sense.

Choose whey proteins at BodyWorld.sk according to your goals and tolerance, and make protein intake simple and sustainable in the long term. And do not forget to check our section of latest offers and discounts.

Frequently Asked Questions (FAQ)

Are whey proteins suitable for women?

Yes, absolutely. The female body needs amino acids for tissue recovery and hormonal balance just as much as the male body does. Whey protein also helps increase satiety, which is key for weight loss.

Does whey protein cause bloating?

For most people, no. However, if you suffer from severe lactose intolerance, we recommend choosing whey protein isolate (WPI) or hydrolysate (WPH), which contain only trace amounts of milk sugar.

Can I combine protein with creatine?

Yes, the combination of protein and creatine monohydrate is commonly used in practice for increasing muscle mass and strength – each substance simply works through a different mechanism (protein = building material, creatine = performance/ATP system). Read more about it in our article Everything about creatine – the most comprehensive, impartial guide based on scientific facts!

Tip: If you require a 100% guarantee of origin, choose the certified form of creatine Creapure®. It is produced by a unique chemical synthesis in Germany, which guarantees maximum purity and the absence of unwanted by-products (such as dicyandiamide). However, it is worth knowing that this purity may come at the expense of poorer solubility compared with modern micronised creatine. In addition, manufacturing standards among most reputable producers are currently at a very high level – all raw materials undergo analytical tests and have their own purity certificates.

Is whey protein suitable for weight loss?

Yes. A higher protein intake increases satiety and helps protect muscle mass during a calorie deficit.

Is isolate better or concentrate?

For most people, concentrate is enough. Isolate is suitable when dieting or if you are sensitive to lactose.

Do I have to take protein immediately after training?

No, not necessarily straight away. The total daily protein intake is more important.