In a double-blind placebo controlled study subjects were given high doses of Vitamin C (ascorbic acid) and found that it lowered rates of depression and anxiety, increased sexual intercourse rates. The study suggests that this is because Vitamin C modulates catacholaminergic activity.
 BACKGROUND: Ascorbic acid (AA) modulates catecholaminergic activity, decreases stress reactivity, approach anxiety and prolactin release, improves vascular function, and increases oxytocin release. These processes are relevant to sexual behavior and mood. METHODS: In this randomized double-blind, placebo-controlled 14 day trial of sustained-release AA (42 healthy young adults; 3000 mg/day Cetebe) and placebo (39 healthy young adults), subjects with partners recorded penile-vaginal intercourse (FSI), noncoital partner sex, and masturbation in daily diaries, and also completed the Beck Depression Inventory before and after the trial. RESULTS: The AA group reported greater FSI (but, as hypothesized, not other sexual behavior) frequency, an effect most prominent in subjects not cohabiting with their sexual partner, and in women. The AA but not placebo group also experienced a decrease in Beck Depression scores. CONCLUSIONS: AA appears to increase FSI, and the differential benefit to noncohabitants suggests that a central activation or disinhibition, rather than peripheral mechanism may be responsible. (Source: Pubmed)
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Still another amazing reason to take that vitamin C. (They’re also experimenting with it to regenerate nerve capacity lost to neuropathy.)
Interestingly, the experiments do use ascorbic acid, rather than the more organic, “natural” forms we’re told over and over are better for us.