# Non-essential amino acids are

$\begin{array}{1 1}(a)\;\alpha\text{ amino acids which are needed for health and growth of human being but are not synthesised by human body}\\ (b)\;\alpha\text{ amino acids which are needed for health and growth of human being and are synthesised by human body} \\(c)\;\alpha\text{ amino acids which are not needed for health and growth of human being and are synthesised by human body}\\(d)\;\alpha\text{ amino acids which are not needed for health and growth of human being and are not synthesised by human body}\end{array}$

$\alpha$ amino acids which are needed for health and growth of human being and are synthesised by human body, eg glycine , alanine, aspartic acid.
Hence (b) is the correct answer.