Serine is an amino acid.   It comes in two forms: L-serine and D-serine.   L-serine is consumed in the diet and D-serine is made in the body from L-serine.  The body uses D- and L-serine to make proteins.
D-serine also sends chemical signals in the brain.  This might help with schizophrenia and other brain conditions. L-Serine is often found in animal based sources such as Atlantic mackerel and herring, it is commonly used as a dietary supplement to support cognitive functions such as memory and mood in the elderly.    For sports nutrition, L-Serine enhance exercise recovery especially in athletes.

• Appearance: White crystalline powder.
• Solubility: Soluble in water.