Bromelain: The Enzyme from Pineapple

Why does the cumbersome word “enteric-coated” appear on so many bromelain jars – and why is the amount given not simply in milligrams, but in odd abbreviations like FIP or GDU? Anyone who understands bromelain also understands these two puzzles. So let’s take it step by step.

Bromelain is a protein-splitting (proteolytic) enzyme mixture found mainly in the stem of the pineapple. As a dietary supplement it is usually offered in enteric-coated form, so that the sensitive enzyme survives the stomach acid and is only released in the small intestine. Its strength is measured not in milligrams, but by the enzyme activity in FIP or GDU units. No health claims are authorised for bromelain in the EU – which is why we describe it factually.

The most important points in brief

• Bromelain is a proteolytic enzyme mixture from the pineapple – obtained predominantly from the stem.
• It is usually offered in enteric-coated form, so that it passes through the acidic stomach as intact as possible.
• Its strength is stated as enzyme activity in FIP or GDU units – not in milligrams alone.
• No health claims are authorised for bromelain in the EU; we make no promises of efficacy.

What bromelain actually is – and what enzymes do in the body

Bromelain belongs to the group of proteolytic enzymes. “Proteolytic” simply means protein-splitting: these enzymes can break down long protein chains (proteins) into smaller fragments. Enzymes themselves are in turn proteins – biological tools that speed up chemical reactions without being consumed in the process. That is a factual description of their nature, not a health promise.

Its origin is interesting: while the sweet fruit ends up in the supermarket, the lion’s share of the bromelain sits in the woody stem of the pineapple, which is otherwise regarded as waste. It is precisely from there that the enzyme is obtained and concentrated for dietary supplements. Pineapple is thus a nice example of the fact that there is more to a plant than what we usually eat.

Incidentally, bromelain is not a single, clean molecule, but a mixture of several closely related enzymes and accompanying substances. That is exactly why it is correct to speak of an “enzyme mixture” rather than “the enzyme bromelain”. In practice this changes nothing – but it is important for interpreting the information on the packaging correctly: the activity indicated refers to the overall protein-splitting performance of this mixture.

An image makes this vivid: you can picture bromelain like a molecular pair of scissors that cuts long, coiled-up protein threads at certain points. It is precisely this “cutting ability” that you want to preserve in an enzyme preparation – and which is at the same time sensitive as soon as the environment becomes too acidic or too hot. This explains almost everything else on its own: the enteric-coated packaging as well as the importance of enzyme activity.

Why “enteric-coated” is the key

Here lies the crux of every enzyme preparation. Bromelain is itself a protein – and the stomach specialises in breaking down proteins with acid and its own enzymes. Without protection, part of the sensitive bromelain would therefore be attacked in the stomach before it could go any further.

That is why manufacturers rely on an enteric-coated capsule or coating. This shell remains stable in the acidic stomach environment and only dissolves in the less acidic small intestine – where the enzyme is meant to be released. This explains why this design is so common in enzyme preparations. How dosage forms affect absorption in general is put into context by Bioavailability explained simply.

FIP and GDU: why activity says more than milligrams

For a vitamin, the milligram figure is enough. For an enzyme, it is misleading. Because 500 mg of bromelain says nothing about how “strong” the enzyme still is – enzymes can lose activity through heat, moisture or ageing without the weight changing. What matters, therefore, is the enzyme activity: that is, how much the enzyme can actually accomplish.

It is measured in standardised units:

In practice this means: do not compare two products by milligrams alone, but look at the stated FIP or GDU figure. A product with a clearly declared, high activity is more meaningful than one that only states the mass.

Bromelain, papain & co.: the family of plant enzymes

Bromelain is not the only protein-splitting enzyme from the plant kingdom, and a brief look at its relatives makes the principle more tangible. The best-known counterpart is papain from the papaya – likewise proteolytic, likewise used in dietary supplements. Both are frequently mentioned together in the supplement field, sometimes even combined together in enzyme complexes.

The comparison shows: it is not an exotic isolated case, but a well-known principle – plants form protein-splitting enzymes that can be isolated and concentrated. You can read more about the papaya counterpart in Papain – the enzyme of the papaya.

What research is investigating

Bromelain is one of the enzymes that have been studied scientifically for a long time. Research is interested above all in the protein-splitting properties and in how the enzyme mixture is present and processed in the digestive tract. These investigations are ongoing and are the subject of the specialist literature – but so far, no established, EU-authorised health-related statements have emerged from them.

That is the honest state of affairs, and we represent it exactly as such: bromelain is well characterised as a proteolytic enzyme, but we derive no promises of efficacy from that. Precisely because many far-reaching claims are circulating online, this restraint is a mark of quality – not a weakness.

Timing, storage and combination

A few practical points that are often asked about with enzyme preparations. Timing: when to take an enzyme preparation depends on the goal and the manufacturer’s recommendation – some users take it with meals, others independently of meals. The decisive factor is the consumption recommendation on the packaging. General guidance on the topic of timing is provided by Nutrients before or after eating?.

Storage: enzymes are sensitive to heat and moisture. Keep bromelain preparations cool, dry and protected from light, and close the jar tightly – this protects the enzyme activity that is the whole point. Combination: anyone taking several preparations should take a look at sensible sequences; guidance is provided by Combining dietary supplements correctly.

Recognising quality: the checklist

Because enzyme preparations depend on processing more than other supplements, it is worth taking a scrutinising look when buying. What matters:

• Stated activity: a clear FIP or GDU figure is the most important criterion – more meaningful than the milligram number alone.
• Enteric-coated dosage form: for an enzyme that is meant to pass through the stomach, a corresponding capsule or coating makes sense.
• Origin and purity: traceable origin and independent laboratory testing speak for reliability.
• Few additives: the clearer the ingredient list, the better the product can be assessed.

A product that transparently states its enzyme activity and is enteric-coated has done its homework – regardless of what expectations one attaches to the enzyme.

An honest assessment

No health claims are currently authorised for bromelain in the EU. That does not mean the enzyme is uninteresting – it means that, in all seriousness, we may not and do not want to claim any specific health effect. What we give you instead is factuality: bromelain is a well-studied, protein-splitting enzyme from the pineapple whose quality can be read from the declared activity.

What you should watch out for when taking it: choose a product with a stated FIP or GDU activity. Anyone who has a pineapple allergy should avoid bromelain. And if you take blood-thinning medication, are pregnant or are facing an operation, please clarify taking it in advance with a doctor.

Matching products from Scheunengut

You will find enteric-coated enzyme preparations in our category Bromelain as well as in the broader area of Enzymes. Anyone who would like to get their bearings on the topic of digestion will find what they need in Gut & Digestion. To go with it, the guides Gut & microbiome, Nutrients and digestion and Papain from the papaya explore the topic in more depth – all Scheunengut products are made and laboratory-tested in Germany.

Frequently asked questions (FAQ)

Why is bromelain often enteric-coated?

Because bromelain is itself a protein and stomach acid attacks proteins. An enteric-coated capsule or coating remains stable in the stomach and only dissolves in the small intestine, so that the sensitive enzyme reaches it as intact as possible. That is why this design is standard for enzyme preparations.

What do FIP and GDU on the packaging mean?

Both are units of measurement for enzyme activity, that is, for the actual performance capacity of the bromelain. FIP stands for an international pharmaceutical standard, GDU for Gelatin Digesting Units. They say more about the strength than the pure milligram amount.

Where does the bromelain in the pineapple come from?

The largest part sits not in the sweet flesh, but in the woody stem of the pineapple, which is otherwise hardly eaten. It is from there that the enzyme is obtained and concentrated for dietary supplements.

Who is bromelain not suitable for?

People with a pineapple allergy should avoid bromelain. Anyone taking blood-thinning medication, who is pregnant or is facing an operation should clarify taking it in advance with a doctor. Since no health claims are authorised for bromelain, we make no promises of efficacy about it.