The question is flawed. Substance can mean element or molecule. I'll go with molecule since organic simply means carbon atoms are present. Hydrogen dioxide is the most abundant inorganic "substance".
Mind is the second most abundant substance in the human body
The most abundant chemical substance in the human body is water. There are a lot of H2O molecules throughout the human body.
This substance is water, H2O.
The human body is made up mostly of water.
The most abundant inorganic compound in a living thing is water.65% of the human body is made up of oxygen, due to the fact that water contains oxygen and water makes up most of the human bodyabout 19% is carbon, which is in almost everything on earth9.7% is hydrogen, again due to water3.2% is nitrogen because of it's relative abundance in proteins, and it is in the lungs1.8% is calcium, found in bones teeth, the nervous system and muscles
An inorganic substance needed by the human body for good health.
Water is the most common molecular subsance found in the human body(~98%). and phosphorous is the most abundant element in human body.
carbon
protein
The body is made mostly of organic compounds. The only abundant inorganic compound is water.
Protein.
Water (H2O)