Benefits
Studied for sexual behavior in rats only
Akarkara root has a long-standing reputation in Ayurvedic and Unani medicine as an aphrodisiac and tonic for male vitality. The only research is in rats. In a study of 32 male Wistar rats, a petroleum ether root extract at 50 and 100 mg per kg increased mounting and intromission frequency and shortened latency, with effects lasting 7 to 15 days after dosing stopped. Nothing has been tested in people, so whether it does anything for human libido or energy is unknown.
Raised testosterone in rats, untested in people
In male rats, an alkylamide-rich ethanol extract of the root raised serum testosterone and increased sperm production. That single rat study is the entire body of evidence. No study has measured testosterone in a human being, and rodent hormone responses do not reliably predict what happens in people.
Traditional use in tooth powders (no studies)
The tingling alkylamides in Akarkara have traditionally been used for oral hygiene and gum comfort. Chewing the root or using extracts in tooth powders produces a localized numbing sensation, and folk practice has used this for occasional dental discomfort. This is tradition only. Neither of the two studies cited on this page looked at teeth, gums or the mouth.
Traditional nerve tonic use (not researched)
Traditional texts describe Akarkara as supporting nerve health and motor tone, and that reputation is the whole basis for this use. The two published studies measured mating behavior and testosterone in rats, not nerve or muscle function, so there is no research behind it.
Traditional rasayana use (energy never measured)
As a classical 'rasayana' herb in Ayurveda, Akarkara has been used to help support stamina and resilience to physical stress. That is a traditional classification, not a tested effect. No study cited here measured stamina, fatigue, exercise capacity or energy in either animals or people.
Mechanism of action
Steroidogenesis modulation
In male rats, extracts of Anacyclus pyrethrum increased serum testosterone and sperm counts. How that happens is not established. The specific steroid-making enzymes named in some marketing materials were not measured in either study cited here, and none of this work was done in humans.
Alkylamide bioactivity
Alkylamides such as pellitorine act on nerve endings in the mouth, which is what produces the tingling, numbing sensation. They share chemical features with compounds in echinacea and Szechuan pepper. That is general chemistry, not a finding from either study cited here, and it has not been shown to produce any whole-body effect.
Nitric oxide: proposed, never measured
Nitric oxide and blood flow are often offered as an explanation for aphrodisiac herbs, but neither study cited on this page measured nitric oxide, blood vessels or erectile tissue. This is speculation rather than a demonstrated mechanism.
Antioxidant root constituents
The root contains polyphenols and essential oil compounds. Antioxidant activity measured in a test tube is not the same as an effect in the body, and no study cited here measured oxidative stress in reproductive tissue, nerve tissue, animals or people.
Clinical trials
Alkylamide-rich ethanol extract of Anacyclus pyrethrum root given to male rats (Sharma 2013, PMID 22473789).
Male rats. No human beings have been studied with this root.
Treated rats showed higher serum testosterone, increased sperm production and higher sperm counts. This says nothing directly about people. There are no placebo-controlled human trials of this root, and both published studies come from the same research group.
Petroleum ether root extract at 50 and 100 mg per kg of body weight, tested on mating behavior (PMID 20727332).
32 male Wistar rats.
Treated rats mounted more often and with shorter latency than controls, and the effect was still present 7 to 15 days after dosing stopped. A rat mating assay is not evidence about human desire, and this result has never been tested in people.