Rejuvenating drug

Levodopa (L-dopa) is a natural intermediate in the biosynthesis of catecholamines in the brain and peripheral adrenergic nerve terminals. In the biologic sequence of events it is converted to dopamine, which in turn serves as a substrate of the neurotransmitter norepinephrine. Levodopa is used successfully in the treatment of Parkinson s syndrome, a disease characterized by dopamine deficiency. When levodopa is administered to an individual with this syndrome, the symptoms of Parkinson s disease are ameliorated, presumably because the drug is converted to dopamine and thereby counteracts the deficiency. Individuals treated with levodopa, especially older men, have been observed to experience a sexual rejuvenation. This effect has led to the belief that levodopa stimulates sexual powers. Consequently, studies with younger men complaining of decreased erectile ability have shown that levodopa increases libido and the incidence of penile erections. Overall, however, these effects are short lived and do not reflect continued satisfactory sexual function and potency. Thus, levodopa is not a true aphrodisiac. The increased sexual activity experienced by parkinsonian patients treated with levodopa may reflect improved well-being and partial recovery of normal sexual functions that were impaired by Parkinson s disease. 

Evergreen trees, weeds, drug-yielding plants, poisonous plants and rejuvenating plants. Mosses, Marshes, Cedar Trees, Palm Trees. 

A product that makes structural and functional claims can be classified as a drug. For instance, a product that penetrates the skin and causes cell rejuvenation has legitimate claims as a drug. 

Singh, N., R. Nath, A. Lata, et aL 1982. Withania somnifera (Ashwagandha), a rejuvenating herbal drug which enhances survival during stress (an adaprtogen). Pharmaceutical Biol. 20 (l) 29-35. 

Sundaram H, Mehta RC, Norine JA, kircik L, Cook-Bolden FE, Atkin DH, et al. Topically applied physiologically balanced growth factors a new paradigm of skin rejuvenation. J Drugs Dermatol 2009 8 4-13. 

Gold MH, Goldman MP, Biron J. Human growth factor and cytokine skin cream for facial skin rejuvenation as assessed by 3D in vivo optical skin imaging.J Drugs Dermatol 2003 6 1018-23. 

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