Safety
According to the International Agency for Research on Cancer, preparations that include more than five percent of crude coal tar are Group 1 carcinogen.
According to the National Psoriasis Foundation and the FDA, coal tar is a valuable, safe and inexpensive treatment option for millions of people with psoriasis and other scalp or skin conditions. Coal tar concentrations between 0.5% and 5% are safe and effective for psoriasis, and no scientific evidence suggests that the coal tar in the concentrations seen in non-prescription treatments is (or is not) carcinogenic because there are too few studies and insufficient data to make a judgement. The NPF states that coal tar contains approximately 10,000 chemicals, of which only about 50% have been identified, and the composition of coal tar varies with its origin and type of coal (for example,: lignite, bituminous or anthracite) used to make it.
Coal tar causes increased sensitivity to sunlight, so skin treated with topical coal tar preparations should be protected from sunlight.
The residue from the distillation of high-temperature coal tar, primarily a complex mixture of three or more membered condensed ring aromatic hydrocarbons, was listed on 28 October 2008 as a substance of very high concern by the European Chemicals Agency.
Read more about this topic: Coal Tar
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