"demonstrated toxicity" is correct and usable in written English.
You can use it to describe a situation where a substance's toxicity (or poisonous nature) has been shown or demonstrated. For example, "Recent safety tests have demonstrated the toxicity of this chemical, and it is not approved for use."
Several widely used new medications have been recalled after post-marketing data demonstrated toxicity.
In the conclusion of our paper, we write: Our results confirmed the presence of L-canavanine (an antimetabolite with demonstrated toxicity in mammals) as a significant component of H. alpinum seeds….
Laboratory research has demonstrated toxicity of low levels of fluoride to Acidithiobacillus species.
Additionally, laboratory 3 only experienced minimal (i.e. 1%) anaerobic degradation of isoFA + 7EO and reported that this test substance demonstrated toxicity towards the inoculum.
In addition to these, a number of other investigators have demonstrated toxicity of carbon nanomaterials to a range of plant species [46, 186].
The intracellular distribution of Nano-Dysferlin was similar to wild-type dysferlin and neither demonstrated toxicity when overexpressed in dysferlin-deficient patient myoblasts.
An extract from their letter seen by Observer Food Monthly states: 'We oppose this health claim because there is abundant evidence that some of the isoflavones [phytoestrogens] found in soy demonstrate toxicity in oestrogen-sensitive tissues and in the thyroid.
These studies demonstrate toxicity and carcinogenicity of riddelliine in rats and mice, and a dose response relationship in female rats and male mice under the experimental conditions employed.
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There are no reports demonstrating toxicity or immunogenicity of aptamers.
Several studies have been designed to demonstrate toxicity of volatile anesthetics in animals.
