is it toxic for health?
No, it is non-toxic to humans and animals.
Boron
Elemental boron, boron oxide, boric acid, borates, and many organoboron compounds are relatively nontoxic to humans and animals
what is referred to as a metalloid? It is a type of chemical element which has a preponderance of properties in between, or that are a mixture of, those of metals and nonmetals. where is it used commonly? In the literature of chemistry. what other names are given to it? "Amphoteric element," "boundary element," "half-metal," etc. can you give two examples of this element? Boron and silicon where is the former one used? In fiberglass for insulation and structural materials
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Boron [SEP] Health issues and toxicity
Elemental boron, boron oxide, boric acid, borates, and many organoboron compounds are relatively nontoxic to humans and animals (with toxicity similar to that of table salt). The LD (dose at which there is 50% mortality) for animals is about 6 g per kg of body weight. Substances with LD above 2 g are considered nontoxic. An intake of 4 g/day of boric acid was reported without incident, but more than this is considered toxic in more than a few doses. Intakes of more than 0.5 grams per day for 50 days cause minor digestive and other problems suggestive of toxicity.