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Independent testing and MHRA enforcement activity (including Operation Pangea) have found that many such products contain incorrect concentrations, impurities, or in some cases entirely different substances to those labelled
Regular blood tests can show if the treatment is working and if changes are needed
Titrate up concentration as tolerated
Nicotinamide (niacinamide) does not cause flushing and has fewer side effects, with nausea and liver toxicity reported only at very high intakes ~3 g/day)
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