It is conceivable that our bodies are having difficulty producing the 4 amino acids present in semen. Per a web search: the predominant amino acids aspartic acid, serine, glycine, leucine and lysine.
I have tested the AA levels in blood and all 5 are low
I have tested the AA levels in blood and 4 are low
I have tested the AA levels in blood and 3 are low
I have tested the AA levels in blood and 2 are low
I have tested the AA levels in blood and 1 is low
I have tested the AA levels in blood and none are low