Guides
In the Scheunengut guide, we explain vitamins, minerals, plant compounds and dietary supplements clearly and with a solid scientific grounding – from correct intake to the right product for you. Use the search or the topic filters to quickly find what you need.
Buying NAC: Forms, Stability & What to Look For
N-acetyl-L-cysteine, usually shortened to NAC, is one of those substances sold as a dietary supplement in very different qualities. If you want to buy NAC, you'll quickly run into questions:...
Buying L-Carnitine: Forms & What to Look For
If you're looking to buy L-carnitine, you'll quickly run into a confusing range of choices: powders and capsules, different forms like tartrate or acetyl-L-carnitine, plus wide price differences and brand...
Buying EAA: Amino Acid Profile & What to Look For
EAA powders are among the most popular supplements in strength and endurance sports - and also among the hardest to compare. At first glance, the labels all look similar, but...
Buying L-Theanine: Purity, Dosage & What to Look For
L-theanine is an amino acid found mainly in the leaves of green and black tea. As a dietary supplement, it is offered either on its own or combined with caffeine...
NAC or Glutathione? Difference, Precursor & Intake
Anyone looking into amino acids and antioxidants quickly comes across two terms that are closely related yet mean something different: NAC and glutathione. Both often appear in the same breath,...
EAA: Essential Amino Acids, Forms & Intake
One abbreviation keeps coming up more and more in the context of sports nutrition and protein intake: EAA. It stands for essential amino acids – the building blocks of protein...
5-HTP from Griffonia: Origin, Forms & Intake
Few ingredients in food supplements are as closely tied to a single plant as 5-HTP is to Griffonia simplicifolia. Its seeds are currently the most important natural source of 5-hydroxytryptophan....
BCAA or EAA? The Honest Comparison
The core in one sentence: EAAs are all nine essential amino acids, BCAAs are only three of them – leucine, isoleucine and valine. BCAAs are therefore a subset of the...
L-Tyrosine: Effects, Intake & Building-Block Function
L-Tyrosine is an amino acid your body uses as a starting material for important messengers and hormones. From tyrosine it forms, among other things, dopamine, noradrenaline and adrenaline as well...
L-Lysine: Effects, Intake & Daily Requirement
L-Lysine is an essential amino acid – your body cannot make it on its own and has to obtain it from food. It is a building block of protein and...
GABA: Effects, Use & What You Should Know
It's 10pm, your mind is still racing, and the thought-carousel keeps spinning – right when you actually want to wind down. It's in exactly these moments that many people come...
Glycine: Effects, Uses & Evening Intake
A teaspoon of white powder, faintly sweet, dissolved in a glass of water after brushing your teeth – that's how unremarkable the evening glycine routine looks for many people. Behind...
Amino Acids: The Complete Overview
Creatine, BCAAs, EAAs, L-theanine, taurine – the shelf of amino acid supplements can feel like a crash course in jargon. Yet behind it all sits a surprisingly simple idea. Short...
L-Glutamine: Effects & Intake (Sport, Gut)
You train four times a week, keep an eye on your protein – and at some point the same name keeps cropping up in forums, in recovery threads and even...
L-Tryptophan: The Amino Acid Explained Factually
Few amino acids are as wrapped in myth as L-tryptophan – from "turkey makes you sleepy" to countless claims about sleep and mood. Here's the fact: L-tryptophan is an essential...
Beta-Alanine: What to Know & How to Use It
You take a pre-workout or pure beta-alanine for the first time – and suddenly your skin tingles on your face, neck and hands. Panic? Completely unnecessary. The tingling (technically paraesthesia)...
Creatine: Forms, Intake & Quality
Few powders are as well known – and as wrapped in myths – as creatine. „Water in the muscle?“, „Loading phase needed?“, „bad for the kidneys?“: Before you dig through...
L-Arginine: What It Is and How to Take It
L-arginine is a proteinogenic, semi-essential amino acid - that is, a genuine protein building block that a healthy body can, in principle, produce itself, though only to a limited extent...
L-Citrulline: Origin, Forms & Intake
You are holding two tubs: "6 g L-citrulline" on one, "6 g citrulline malate 2:1" on the other - same price. Which one delivers more? The answer surprises many people...
L-Carnitine: What to Know & How to Take It
L-carnitine is an amino-acid-like compound that the body can produce itself from the amino acids lysine and methionine. Through the diet it occurs above all in red meat – plant-based...
Taurine: What It Is and How It Is Used
Taurine is not an artificial energy-drink ingredient, but a substance your own body produces through its metabolism and which is found in fish, meat and seafood. And no – it...
L-theanine: origin, forms & intake
Want to be alert without feeling wired – the concentrated calm you know from a good cup of green tea? One name keeps coming up for exactly that: L-theanine, the...
NAC (N-Acetyl-Cysteine): Effects, Intake & Key Facts
NAC (N-acetyl-cysteine) is a particularly stable form of the sulphur-containing amino acid L-cysteine – precisely the building block that determines in the body how much glutathione can be produced. That...
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