All About Amino Acids
Understanding the building blocks of your body
What are amino acids?
Amino acids are the fundamental building blocks of proteins, which play crucial roles in nearly every biological process in the body. Think about muscle repair, enzyme production to hormone regulation and immune function. Humans utilize 20 amino acids for protein synthesis.
These amino acids are categorized based on whether or not our bodies can produce them:
- Essential amino acids (EAAs): cannot be synthesized by the human body and must be obtained through diet.
- Non-essential amino acids: can be synthesized by the body and do not need to be consumed directly.
- Semi-essential (or conditionally essential) amino acids: are typically synthesized by the body but may be required from the diet in higher amounts during growth, illness, or stress.
An insufficient intake of essential amino acids can lead to muscle breakdown, fatigue, and a weakened immune system. EAAs are found in a wide range of animal and plant-based foods, including meat, fish, eggs, dairy, as well as soy, quinoa, nuts, and seeds.
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Amino acids for meat consumers, vegetarians and vegans
Animal proteins generally contain all essential amino acids in adequate proportions (called complete proteins), not all plant-based sources do. This means that people who only consume vegan products have to be aware of their amino acid intake. It is recommended to combine multiple plant based protein sources or take an EAA supplement to ensure sufficient intake.
BCAA versus EAA supplementation
Branched-chain amino acids (BCAAs), leucine, isoleucine, and valine, are a subgroup of EAAs and important for muscle metabolism. However, since they represent only three out of the nine essential amino acids, full EAA supplements are generally more beneficial than BCAA-only products. With an EAA supplement only, you’ll usually get enough BCAA’s in as well so don’t fall for marketing traps ;).
The 20 Amino Acids Used by Humans
| Category | Amino Acid | Notes |
|---|---|---|
| Essential | Histidine | Important for growth and tissue repair |
| Essential | Isoleucine | Supports muscle metabolism and energy production |
| Essential | Leucine | Stimulates muscle protein synthesis |
| Essential | Lysine | Vital for collagen formation and calcium absorption |
| Essential | Methionine | Provides sulfur and aids in detoxification |
| Essential | Phenylalanine | Precursor for dopamine, norepinephrine, and epinephrine |
| Essential | Threonine | Important for collagen and elastin in connective tissues |
| Essential | Tryptophan | Precursor for serotonin and melatonin |
| Essential | Valine | Supports muscle repair and energy regulation |
| Non-essential | Alanine | Helps convert glucose into energy |
| Non-essential | Asparagine | Plays a role in nerve signaling and ammonia metabolism |
| Non-essential | Aspartic acid | Supports the urea cycle and hormone production |
| Non-essential | Glutamic acid | Primary neurotransmitter in the CNS |
| Non-essential | Serine | Involved in fat metabolism |
| Conditionally essential | Glutamine | Fuel for immune cells; essential during stress |
| Conditionally essential | Arginine | Needed for nitric oxide production; essential for infants |
| Conditionally essential | Cysteine | Supports antioxidant defense (from methionine) |
| Conditionally essential | Glycine | Part of collagen; important in detoxification |
| Conditionally essential | Proline | Important for collagen stabilization |
| Conditionally essential | Tyrosine | Synthesized from phenylalanine; precursor to thyroid hormones |
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