Amino acids sound technical. They are not. They are simply the building blocks of the protein in your everyday food. Here is a friendly guide to three of them, and where they sit in your daily capsule.
N7-Neo Metabolism Blend contains L-arginine, L-glutamine and L-leucine as part of its seven-ingredient formula. You can see the full product on the N7-Neo UK page. This guide explains what each amino acid is, in plain British English.
What are amino acids?
Amino acids are small organic molecules. Link them together in chains and you get protein. Your body, and every animal and plant, uses them as building blocks. There are around twenty that matter for human nutrition.
Some are called essential, which means we must get them from food. Others the body can make itself. Nutrition scientists often group them like this:
| Group | Meaning | Examples |
|---|---|---|
| Essential | Must come from food | L-leucine |
| Non-essential | The body can make them | L-glutamine |
| Conditionally essential | Needed more in certain situations | L-arginine |
The letter L simply describes the form that occurs naturally in food and in the body.
Where do amino acids come from in a normal UK diet?
From protein foods, which most of us eat every day. A varied British diet usually covers it well.
- Meat and poultry: chicken, beef, lamb and turkey.
- Fish and seafood: salmon, cod, tuna and prawns.
- Eggs and dairy: eggs, milk, cheese and yoghurt.
- Pulses: beans, lentils and chickpeas.
- Nuts and seeds: peanuts, almonds, pumpkin seeds.
- Soya and wholegrains: tofu, oats and wholemeal bread.
A supplement is an extra. It never replaces a good plate of food.
What is L-arginine?
L-arginine is an amino acid found in protein-rich foods such as meat, poultry, fish, dairy products, nuts and seeds. In supplements it is commonly used as L-arginine hydrochloride (HCl), a stable form that suits capsules.
Each N7-Neo capsule contains 100 mg of L-arginine HCl.
What is L-glutamine?
L-glutamine is one of the most plentiful amino acids in the body. It is found in foods such as meat, fish, eggs, dairy, tofu, beans and some vegetables. Food supplement makers usually produce it through fermentation of plant sugars, then purify it into a fine white powder.
Each N7-Neo capsule contains 51 mg of L-glutamine.
What is L-leucine?
L-leucine is an essential amino acid, so it must come from food. It appears in meat, fish, eggs, dairy products, beans and lentils, and it is one of the three so-called branched-chain amino acids (BCAAs), together with isoleucine and valine.
Each N7-Neo capsule contains 50 mg of L-leucine.
The three amino acids in N7-Neo at a glance
| Amino acid | Per capsule | Found in everyday foods such as |
|---|---|---|
| L-arginine HCl | 100 mg | Meat, poultry, fish, dairy, nuts, seeds |
| L-glutamine | 51 mg | Meat, fish, eggs, dairy, tofu, beans |
| L-leucine | 50 mg | Meat, fish, eggs, dairy, beans, lentils |
There are no authorised health claims on the GB register for L-arginine, L-glutamine or L-leucine, so we simply describe what they are and where they come from.
Three amino acids and four more ingredients in one capsule
Get N7-Neo at the official store 60-day money-back guarantee · Free delivery · 30-day supply per packHow do the amino acids sit alongside the rest of the formula?
N7-Neo is a blend of seven active ingredients in one daily capsule. The three amino acids make up one group. The other four are:
- Apple cider vinegar extract (100 mg), made from fermented apples. See our apple cider vinegar capsules guide.
- Guarana extract (100 mg), from a plant whose seeds naturally contain caffeine.
- Zinc (15 mg, 150% NRV), as zinc citrate.
- Chromium (40 mcg, 100% NRV), as chromium picolinate.
Zinc and chromium are the two ingredients with authorised wording in Great Britain. You can read about them in our zinc and chromium guide.
What about the guarana in the formula?
Guarana is a climbing plant from the Amazon basin. Its seeds naturally contain caffeine, and guarana extract is a common ingredient in drinks and supplements. If you are sensitive to caffeine, keep an eye on your total across the day, including tea, coffee, cola and energy drinks. The safety guide has more: N7-Neo safety and suitability.
Who should check with a GP first?
Amino acid supplements are for adults. N7-Neo is not recommended for under 18s. Please speak to your GP or pharmacist first if you:
- Are pregnant or breastfeeding.
- Take regular medication, in particular for blood pressure or diabetes.
- Have a kidney, liver or other medical condition.
- Are planning surgery or a medical procedure.
How do I take N7-Neo?
Take one capsule once a day, whole, with two large glasses of water. The directions allow it 15 to 30 minutes before a meal, or with lunch or dinner. If swallowing capsules is hard, you can open one and mix the contents with water. There is more in how to take N7-Neo.
Tips for choosing amino acid supplements in the UK
- Read the amount per capsule for each amino acid, in milligrams.
- Look at the form, such as L-arginine HCl, so you know what you are buying.
- Check the extras in the formula, including any caffeine source.
- Compare cost per day rather than price per pack.
- Look for a guarantee. N7-Neo comes with a 60-day money-back guarantee.
Ready to see the whole formula in one capsule? Visit the official N7-Neo store.
Why do the doses look so small?
Milligrams are tiny. A gram is 1,000 mg, so 100 mg of L-arginine is a tenth of a gram. For comparison, a normal portion of chicken breast contains many grams of protein, made of all the amino acids put together. A capsule is a small, measured addition, not a protein shake in a shell.
| Source | Rough idea of scale |
|---|---|
| Palm-sized chicken breast | Tens of grams of protein |
| A glass of milk | Several grams of protein |
| One N7-Neo capsule | 100 mg + 51 mg + 50 mg of three amino acids |
What does "HCl" mean on the label?
You will see L-arginine HCl on the N7-Neo list. HCl stands for hydrochloride. It simply means the amino acid is paired with a small chloride part, which makes the powder stable and easy to put into a capsule. It is a standard form used across the supplement world.
Eating well for a full amino acid line-up
If you eat meat, fish, eggs or dairy, you get all the essential amino acids naturally. If you eat plant-based, mixing foods through the day, such as beans on wholemeal toast or lentils with rice, gives a good variety.
- Include a protein food at every meal.
- Mix your sources across the week.
- Add pulses to soups, stews and salads.
- Enjoy nuts and seeds as snacks.
Vegetarian and vegan shoppers
Plenty of British households eat plant-based, so it is a fair question. N7-Neo uses a plant-based HPMC capsule shell. For the sourcing of each ingredient, check the latest label and the seller's product information before you buy.
If you already eat plenty of protein foods, the small amounts in a capsule simply sit alongside your meals. Everyone's diet is different, so use the label as your guide and keep to the stated daily amount.
Want the whole formula in one daily capsule? See what is on offer at the official store.
Frequently asked questions
What are amino acids?
Amino acids are small molecules that link together to form protein. They are found in protein foods such as meat, fish, eggs, dairy, pulses, nuts and seeds.
How much L-arginine, L-glutamine and L-leucine is in N7-Neo?
Each capsule contains 100 mg of L-arginine HCl, 51 mg of L-glutamine and 50 mg of L-leucine.
Where do these amino acids come from?
All three occur naturally in protein-rich foods. In supplements they are typically produced by fermentation and then purified.
Are there authorised health claims for these amino acids?
There are no authorised health claims on the GB register for L-arginine, L-glutamine or L-leucine, so this guide describes what they are and where they come from.
Does N7-Neo contain caffeine?
N7-Neo contains guarana extract, and guarana seeds naturally contain caffeine. Keep an eye on your total caffeine across the day.
Who should speak to a GP before taking amino acid supplements?
If you are pregnant, breastfeeding, taking medication or have a medical condition, speak to your GP or pharmacist first. N7-Neo is not recommended for under 18s.
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Last reviewed 19 October 2026. This guide is general information about a food supplement.