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Conditional (Non-Essential) Amino Acids Glutamine. Probably the most abundant and naturally occurring amino acid of the conditional ones is the glutamine, an L-Arginine. If you have read our guide to L-arginine, you probably know that this amino acid is necessary for the Carnitine.

Carnitine. Amino acids play a vital role in the numerous functions of the body; they are the building block of protein. Twenty amino acids are needed by the body to build various proteins used in the repair, growth, and maintenance of body tissues.

Amino acids are a crucial, yet basic unit of protein, and they contain an amino group and a carboxylic group. They play an extensive role in gene expression process, which includes an adjustment of protein functions that facilitate messenger RNA (mRNA) translation (Scot et al., 2006). The neutral amino acids are tyrosine, serine, threonine, cysteine, glutamine, and asparagine. Note that tyrosine is both polar and aromatic. The acidic amino acids are glutamic acid (glutamate) and aspartic acid (aspartate).

The basic amino acids are lysine, histidine, and arginine. Next to the 8 essential amino acids, there are around 14 non-essential amino acids and a whole host of other metabolites classed as amino acids which are derived from the 8 essential ones. Next to the 8 essential aminos, I will try to discuss a number of them that have made the headlines recently: L-Glutamine, L-Arginine, L-Carnitine, L-Cysteine, and HMB. The essential amino acids are histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine. Amino acids can’t be stored by the body in the same manner as fat and starch, so it’s important that we obtain those that we cannot synthesise from our diet.

There are nine essential amino acids, which you must get through your diet: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine. They’re vital for. While essential amino acids are indeed the building blocks of proteins, they also perform many other important physiologic functions. For example, essential amino acids regulate genetic expression, including genes related to oxidative stress and immunity.

There are 20 different types of amino acids, 9 of which are essential to the human body but cannot be produced by our systems. Amino acids help build and maintain muscle tissues, but also play a role in your immune system, metabolism, heart health, and brain function. Put simply, amino acids are the building blocks of proteins in our bodies and they make up over 3/4 of the human body.

There are 20 amino acids found naturally in the body and 8 that are considered “essential” for humans because our bodies cannot create them naturally, and therefore must be taken into our bodies by diet.

List of related literature:

Although there are as much as ten essential amino acids (marked by e) to man: eight are more important, namely threonine, valine, leucine, isoleucine, lysine, methionine, phenylalanine and tryptophan.

“Natural Products” by O.P. Agarwal
from Natural Products
by O.P. Agarwal
Krishna Prakashan,

The nine essential amino acids must be obtained from the diet and are cysteine, proline, leucine, isoleucine, valine, tryptophan, phenylalanine, methionine, and histidine.

“Introduction to Medical-Surgical Nursing” by Adrianne Dill Linton, PhD, RN, FAAN
from Introduction to Medical-Surgical Nursing
by Adrianne Dill Linton, PhD, RN, FAAN
Elsevier Health Sciences, 2015

These eight amino acids are known as “essential,” implying that they must be present in the diet.

“Concepts of Athletic Training” by Ronald P. Pfeiffer, Brent C. Mangus
from Concepts of Athletic Training
by Ronald P. Pfeiffer, Brent C. Mangus
Jones and Bartlett Publishers, 2005

Many animals, including adult humans, require eight amino acids in their diet: isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.

“Campbell Biology Australian and New Zealand Edition” by Jane B. Reece, Noel Meyers, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
from Campbell Biology Australian and New Zealand Edition
by Jane B. Reece, Noel Meyers, et. al.
Pearson Australia, 2015

Most needed are the branched-chain amino acids (BCAA) you read about earlier.

“The Paleo Diet for Athletes: The Ancient Nutritional Formula for Peak Athletic Performance” by Loren Cordain, Joe Friel
from The Paleo Diet for Athletes: The Ancient Nutritional Formula for Peak Athletic Performance
by Loren Cordain, Joe Friel
Rodale Books, 2012

For the record, there are 20 amino acids (some researchers now count 22), of which 11 are “essential.”

“Exercise Is Medicine: How Physical Activity Boosts Health and Slows Aging” by Judy Foreman
from Exercise Is Medicine: How Physical Activity Boosts Health and Slows Aging
by Judy Foreman
Oxford University Press, Incorporated, 2020

Nine of these amino acids are “essential,” cannot be synthesized by humans, and must be obtained in the diet.

“Crush Step 1 E-Book: The Ultimate USMLE Step 1 Review” by Theodore X. O'Connell, Ryan Pedigo, Thomas Blair
from Crush Step 1 E-Book: The Ultimate USMLE Step 1 Review
by Theodore X. O’Connell, Ryan Pedigo, Thomas Blair
Elsevier Health Sciences, 2017

Humans require nine amino acids in their diet: threonine, tryptophan, methionine, lysine, phenylalanine, isoleucine, valine, histidine, and leucine.

“Concepts in Biology' 2007 Ed.2007 Edition” by Enger, Eldon Et Al
from Concepts in Biology’ 2007 Ed.2007 Edition
by Enger, Eldon Et Al
Rex Bookstore, Inc.,

The remaining 8 amino acids must be obtained from our diets; thus they’re considered “essential.”

“The Healing Powers of Vinegar (3rd edition)” by Cal Orey
from The Healing Powers of Vinegar (3rd edition)
by Cal Orey
Kensington Books, 2008

In the nutrition field, 20 amino acids are divided into two categories: essential (indispensable) amino acids and nonessential (dispensable) amino acids.

“Amino Acid Fermentation” by Atsushi Yokota, Masato Ikeda
from Amino Acid Fermentation
by Atsushi Yokota, Masato Ikeda
Springer Japan, 2017

Alexia Lewis RD

Registered Dietitian Nutritionist and Certified Heath Coach who believes life is better with science, humor, and beautiful, delicious, healthy food.

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  • In 2 month from now on, you certainly can get 10 pounds in muscle & drop 5 10 lbs in fat. You just need a successful workout plan, correct nutrition plan & begin right now.

  • screw corcioch, learnninjava, bergie, thefurley ghost1, why look this up if you are just going to complain about it. u little bitches

  • Lee question for you. Since I have psoriatic arthritis I go extremely light on machines but rest periods are minimal between 30 seconds,and a minute. I’m 62 would Amino’s have any benefits in my way of working out say an hour 3 days a week.As always thank you for your on point advice

  • Lee, I have been using your plan in First I used your plan in 2014 summer. I use to be around 250 lbs. I dropped down to 200 lbs in 3 and half months. Eventually, I used other plans in and I went down to 180 lbs before the end of the year. But, I ginned back 25 lbs after I went on a vacation in the beginning of this year in 2015. I could not recover from that. I tried out different things nothing worked. Then recently, I thought I give your program another try since it worked before. So, I started using your program and your supplements again. In last 4 weeks I went from 208 lbs to 190 lbs. Personally, I would like to thank you. Please let me know if you have any suggestion for me. My height is about 5 ft 9″. My goal weight is 170 lbs.

  • Hi there, have you seen Smashing Ripped X? (look for it on Google) You will learn about the crimes we commit against ourselves. With Smashing Ripped X, you will discover how to build muscle fast.

  • Wow. Amazing movie.

    My buddy used to be a flabby. He went from 290lbs of pure fat to 212 lbs of genuine lean muscle. I could not believe it! I just signed up myself because I plan to expand my entire body. He made use of the Muscle Building Bible (Search on Google)…

  • Whats the difference between amino acids nd proteins? I know like chicken, fish, protein powder, etc. are proteins, and things like olives, flaxseed and avocado are amino acids, but whats the difference, nd how do they work/ affect your body?? Like amino acids are the “building blocks of proteins” but what does that mean? does this mean when u consume proteins your body breaks it down then builds it back up(into mussel?) & does this mean amino acids turn directly into protein/mussel? plz help!!

  • Crazy clip. Wonderful film clip. My brother used to be an overweight gent. He went from 283lbs of pure fat into 215lbs of massive muscle. Everybody was amazed. I just joined myself coz I wanna beef up. He made use of the Muscle Building Bible (Look in Google)…

  • the comments are just full of students when their science teachers asks them to watch this video because of their retarded brains cannot understand the measning of dna

  • should I chew the tablets or swallow them with water, they taste horrible and at the same time they are too big to be swallowed…

  • Thanks Lee, as always love the videos and insight. absolutely keep them coming, in my eyes you were always the GIANT KILLER of the 90’s!

  • Great video team! I still have one doubt. What happens when a person eats a high amount of protein (high protein diets+supplements) but doesn’t work out?

  • If you are looking to get some muscle and be stronger, you must make a search on Google for “Oak Muscle Method”. You are surely going to get the body you want.

  • amino acids are already in your protein powder. the only people that think amino acids is a good supplement are selling it for profit. DON’T waste your money on this garbage

  • I am here because there is an asshole says that life is made up by an explosion and these stuff are organized randomly. HE LOOKS SO STUPID TO ME NOW.

  • I first got tipped off on amino acids after reading a book about digestive issues. Proteins are very hard to digest and a supplement may be a great way to combat the deficiencies that many with digestive disorders struggle with. Curious to try out some supplements. More searching to do for a good one.

  • Nothing bad happens when you stop taking it. You probably would not recover as fast as taking Glutamine though.

    I just bought it and going to see how it works.

  • Hi Kamla. The session was very informative. I have a basic query for protein source that I am following. Full fat milk 1 portion and 3 portions of water, boil it and put 15 drops of lemon and once the paneer is separated I e comes up on surface. Remove water with cloth and drink that water.
    Is this also a good source of protein based at home.
    Please clarify. Thank you

  • Ive been told to take amino acids separately from protein because it binds to the protein, in turn hindering the effect of the isolated amino acid. Is this true or have I been told a lie?

  • I am not here for school but i am also here for school. I checked the next years units for me and the first one is dna. But i dislike the education system and the way they teach us so instead of studying the old and traditional way, this is what i am going to do. I love learning a lot but when i think of it as school i hate it. I discovered that when i learn something because i was curious i don’t even need to study for it. So if schools suck at teaching and i learn better when i research by myself youtube is a great platform.

  • Hey there, have you considered “MUSCLEader (just search Google)? On their website you can watch a smart free video showing how to build up notable muscle really fast whilst dropping excess fat as well. Kev or many other guys like him enjoyed positive results using this method. I hope it will help you too…

  • They laughed when I told them I would bulk up with \”Xraggy Muscle Max\”, but then they saw the results. Google Xraggy Muscle Max to see their reaction. (You should see their faces!)

  • Hello, have you heard about MUSCleader (have a look on Google)? On their website you can watch a useful free video explaining the best way to develop visible muscle mass very fast whilst reducing body fat at the same time. Brandon and hundreds of guys with the same goal experienced amazing success applying this method. It may work for you also…

  • When are humans going to start addressing the facts…

    DNA changes over someone’s lifetime?

    Humans…. you have your theories about DNA completely wrong!

  • Your class was perfect for me to understand all this concepts that were before not so clear.
    thank you for sharing this concepts, so I can advance my knowledge with genetics.
    Roberto Pizano

  • Mam! Thanks for all the info but you need to update your knowledge a little bit. That 30 minute window after workout theory is a myth. It’s been proven in a lot of studies.

  • Am I the only one who can’t see the animation? I can here the voice perfectly but I miss the animation where I can see what he explains

  • I take for digestion and recovery. Works great. Thanks to the great Leroy Colbert for ways recommending Glutamine. He always said to take 20 grams daily on an empty stomach and never mix mix protein shake. R.I.P. Leroy!

  • Hello there, have you considered “MuscLeader” (just search Google)? On their website you will find a useful free video featuring the best way to start building notable muscles really fast while shedding unwanted fat at the same time. Ryan and plenty other guys had good results using this strategy. Perhaps it will help you out also.

  • When and how are the best ways to take amino acid supliments? For example: I have been told to take them first thing in the morning with a full glass of water, about an hour before you eat. Is this true, or a good way/time to take them?

  • is it ok to mix glutamine with my protien shake? people are telling me not to mix with my protien! also why does it add water weight to me and make my gut hold massive amount of h20. and why do I sweat so much when taken glutamine and lifting?

  • Hi kamala. why not you introduce in telugu language. And English is also very fluently.. some subtitles is wrong on the screen.
    I am going to fast running 1600 meeters with in 4.45 minutes.
    So what I have to do..

  • My classmates laughed when I told them I was going to build muscle with “Smashing Ripped X”, but then I showed them the results. Go Google Smashing Ripped X to see their reaction. (It was epic!)

  • The only thing that will happen is you will no longer have the maximum available L Glutamine in your body. There is no other side effect. I know this as I take L Glutamine almost everyday. I rarely miss a dose. To me it is my most important supplement. I love it for immune system support. I pretty much never get sick anymore. Even if I do the symptoms are mild and last only 24 hours. IT IS AMAZING!

  • It would be a shame for you not to build muscle when these people accomplish it so easily using “Smashing Ripped X” (search for it on Google).

  • Crazy clip. Terrific vid.

    My younger brother had been an overweight fella. He revolutionized his body from 285 lbs of fat to 219lbs of pure lean muscle. I found myself dumbfounded. I just signed up myself because I would like to greatly improve my whole body. He used the Muscle Building Bible (Search on Google)…

  • Hi Lee. I love your videos. I find them very informative. Question…concerning protein alternatives, what is your take on Plant Based vs. Animal Based proteins?

  • The study of DNA & RNA at the cellular level does seem “magical” and should be testimony toward an alternate view intelligent design vs. evolution. The simple fact that a DNA strand sticks together; or that a Cellular Membrane is formed every time a new Cell is developed, is beyond randomness or even controlled replication.

  • @nikopikox amino acids are basically proteins with essential and non essentials, but it’s just an easier way to consume protein for people who don’t eat much, it’s also made to be absorbed faster than food, so after working out it is absorbed faster to repair muscle fibers:D

  • I already told you. i know the bad fat is the reason that stopping 6 pack coming outside even we work out well.

    Between My international body building trainer also recommended this 7 food elements to kill your fat belly.

    if you are serious go for it now

  • I think im more confused now than before lol! All I wanted to know is what they do…I think they enhance the process of absorbing protein?