As some natural substances are CMR substances, as shown above, they might be candidates for REACH Annex XIV (list of substances subject to authorization) ([1] Art. 57).
Harvard again: "There are hundreds, probably thousands, of different substances that can act as antioxidants... Some substances that act as antioxidants in one situation may be prooxidants electron grabbers in a different chemical milieu.
According to Tusi, internal contradictions began appearing, and as a result, some substances began developing faster and differently from other substances.
It is to be noted, however, that number of cigarettes smoked was very low (on average one cigarette per day) and that we asked participants to refrain from the use of supplements in the 24 h before blood testing; thus, it is very likely that some substances as vitamin C were washed-out.
Significant concentrations of uranium occur in some substances such as phosphate rock deposits, and minerals such as lignite, and monazite sands in uranium-rich ores (it is recovered commercially from sources with as little as 0.1% uranium ).
Organic extracts contained carotenoids as well as some waste substances, such as chlorophyll [35, 36].
Some substances such as insecticides are toxic to one individual and not to another.
In addition, some substances produced as metabolic by-products are toxic in themselves and must be removed from living cells at a rate equal to that at which they are produced by those cells.
Some substances such as proton pump inhibitors can affect the absorption of vitamins and minerals and are increasingly suspected to cause or contribute to bone fractures [9, 10].
For some substances— such as steam and ammonia, enthalpy values are either tabulated or given in the form of a graph as a function of temperature and pressure and hence, can be determined easily.
