Methamphetamine is addictive.[40] While not dangerous, withdrawal symptoms are common with heavy use and relapse is common. Various organizations, such as Crystal Meth Anonymous, are available to combat relapse. Methamphetamine-induced hyperstimulation of pleasure pathways leads to anhedonia. It is possible that daily administration of the amino acids L-Tyrosine and L-5HTP/Tryptophan can aid in the recovery process by making it easier for the body to reverse the depletion of dopamine, norepinephrine, and serotonin. Although studies involving the use of these amino acids have shown some success, this method of recovery has not been shown to be consistently effective.[citation needed] It is shown that taking ascorbic acid prior to using methamphetamine may help reduce acute toxicity to the brain, as rats given the human equivalent of 510 grams of ascorbic acid 30 minutes prior to methamphetamine dosage had toxicity mediated[41][42], yet this will likely be of little avail in solving the other serious behavioral problems associated with methamphetamine use and addiction that many users experience. Large doses of ascorbic acid also lower urinary pH, reducing methamphetamine’s elimination half-life and thus decreasing the duration of its actions.[43] To combat addiction, doctors are beginning to use other forms of amphetamine such as dextroamphetamine to break the addiction cycle in a method similar to the use of methadone in the treatment of heroin addicts. There are no …