The phrase "an important substance" is correct and usable in written English.
You can use it when discussing the significance or value of a particular substance in a scientific, medical, or general context.
Example: "Water is an important substance for all living organisms, as it plays a crucial role in various biological processes."
Alternatives: "a vital compound" or "a key element".
Acetaldehyde is an important substance for tumor regression.
Research done then showed that PPIs impede the production of an important substance, nitric oxide, in the endothelial cells that line all of the nearly 100,000 miles of blood vessels in an average adult's body.
Plasma levels of insulin-like growth factor-I (IGF-I), an important substance for maintaining cardiovascular homeostasis, are lower in spontaneously hypertensive rats (SHR) than in normotensive Wistar Kyoto rats (WKY).
Citric acid (CA, C6H8O7) is an important substance used mainly in the pharmaceutical and food industries, as well as in detergents and cleaning products, cosmetics and toiletries (Soccol et al. 2006).
It simply isn't fair for the females of our species to abruptly lose such an important substance... and why?
As a potent hepatotoxin, carbon tetrachloride (CCl4) continues to serve as an important substance in medicinal research, particularly in the investigation of hepatotoxin-induced liver diseases [ 1].
Cannabis plants produce a second important substance called cannabidiol, or CBD.
Compound 2 is a known medicinally important substance that was previously isolated from Entada africana [ 35], Acer ginnala [ 36] and Galla rhois, and has been reported to possess antimicrobial activities [ 37] and anti-asthmatic effects [ 38].
PSAT and PSPH may have neurotrophic potential but more likely function to provide proliferating cells with a limiting and conditionally important substance (L-serine) that is required for synthesis of macromolecules, amino acids, and purines that are needed to accomplish mitosis [ 80].
"It's an important signal but there is also important substance to it".
The antimony film electrode (SbFE) was used for expedient measurement of pantoprazole, i.e. an important pharmaceutical substance.
