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In page Smart shop:

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Many of the paraphernalia and complements sold in smart shops reduce, in one way or another, the harm associated with illegal drugs. For instance, reagent kits for testing the purity of ecstasy can be essential now that tablets named ecstasy can in practice contain just about anything, and often do not, in fact, contain MDMA at all. Supplements of vitamins and amino acids have been developed to mitigate specifically the damage of certain illegal drugs. Tryptophan and 5-hydroxy-tryptophan, for instance, can be used to help the body replenish serotonin levels in the brain after the use of MDMA, and vitamin supplements are appropriate for users of stimulants such as amphetamine. Vitamin B12 is depleted by recreational use of nitrous oxide, and is thereby useful.