There are three main different types of amino acids.
Essential Amino Acids
Essential amino acids cannot be synthesized by the human body, and therefore they must come from the things that we eat and drink.
If your body doesn’t get enough amino acids from the food you eat, you can supplement additional amino acids by taking the right supplements.
Non-Essential Amino Acids
The human body can make it’s own non-essential amino acids, so while they can come from the things we eat and drink, it isn’t as important to include them as part of a balanced diet because our bodies can make their own as needed.
Conditional Amino Acids
Just because the body is capable in principle of producing an amino acid doesn’t mean it is actually doing so at any given moment. An example of this would be glycine which is an amino acid that the body can make (and for this reason, it has been traditionally classified as nonessential). The body makes glycine by taking serine and transforming it with the help of an enzyme and vitamin B6. If a person is deficient in vitamin B6, it cannot convert serine into glycine. In this situation,
it becomes extremely important for that person to consume glycine in the diet. In other words, under circumstances of vitamin B6 deficiency,
glycine becomes an essential amino acid.