16 best brain-boosting natural stimulants -

American ginseng

Scholey, Andrew, et al. "Effects of American ginseng (Panax quinquefolius) on neurocognitive function: an acute, randomized, double-blind, placebo-controlled, crossover study." Psychopharmacology 212.3 (2010): 345-356. >

Barton, Debra L., et al. "Wisconsin Ginseng (Panax quinquefolius) to ameliorate cancer-related fatigue: a randomized, double-blind trial, N07C2." Journal of the National Cancer Institute 105.16 (2013): 1230-1238. >

Rhodiola rosea

Olsson, Erik MG, Bo von Schéele, and Alexander G. Panossian. "A randomized, double-blind, placebo-controlled, parallel-group study of the standardized extract shr-5 of the roots of Rhodiola rosea in the treatment of subjects with stress-related fatigue." Medical plant 75.02 (2009): 105-112. Maca

Stone, Mark, et al. "A pilot investigation into the effect of maca supplementation on physical activity and sexual desire in sportsmen." Artichoke extract Journal of ethnopharmacology 126.3 (2009): 574-576. H4>

Lelkes, Z., et al. Barad, Mark, et al., "Anti-depressants, anti-depressants that increase the availability of cAMP, transiently enhancements wakefulness in rats."

Et al. "Rolipram, a type IV-specific phosphodiesterase inhibitor, facilitates the establishment of long-lasting long-term potentiation and improves memory." Proceedings of the National Academy of Sciences 95.25 (1998): 15020-15025.

Lion's mane

Mori, Koichiro, et al. "Improving effects of the mushroom Yamabushitake (Hericium erinaceus) on mild cognitive impairment: a double-blind placebo-controlled clinical trial." Phytotherapy Research 23.3 (2009): 367-372.

Stough, Con, et al. "Examining the nootropic effects of a special extract of Bacopa monniera on human cognitive functioning: 90 day double-blind placebo-controlled randomized trial." Phytother Res 22.12 (2008): 1629-34. >

Pass, Matthew P., et al. "The cognitive-enhancing effects of Bacopa monnieri: a systematic review of randomized, controlled human clinical trials." The Journal of Alternative and Complementary Medicine 18.7 (2012): 647-652.

P> Sivaramakrishna, Chillara, et al. "Triterpenoid glycosides from Bacopa monnieri." Phytochemistry 66.23 (2005): 2719-2728. Ashwagandha

Mishra, Lakshmi-Chandra, Betsy B. Singh , and Simon Dagenais. "Scientific basis for the therapeutic use of Withania somnifera (ashwagandha): a review." Alternative medicine review 5.4 (2000): 334-346

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Chengappa, KN Roy, et to the. "Randomized Placebo-Controlled Adjunctive Study of an Extract of Withania somnifera for Cognitive Dysfunction in Bipolar Disorder."

The Journal of Clinical Psychiatry 74.11 (2013): 1076-1083. , Biswa Mohan, et al. Integrative cancer therapies 12.4 (2013): 312-322.

H4> Gotu kola

Wattanathorn, Jintanaporn, et al. "Positive modulation of cognition and mood in the healthy elderly volunteer following the administration of natural mental stimulant Centella asiatica." Journal of ethnopharmacology 116.2 (2008): 325-332.

Bradwejn , Jacques, et al. "A double-blind, placebo-controlled study of the effects of Gotu Kola (Centella asiatica) on acoustic startle response in healthy subjects with a herbal stimulant." Journal of clinical psychopharmacology 20.6 (2000): 680 -684.

Haskell, Crystal F., et al. "The effects of L-theanine, herbal stimulants, caffeine and their combination on cognition and mood." Biological psychology 77.2 (2008): 113-122.

Lardner, Anne L "Neurobiological effects of the green tea constituent theanine and its potential role in the treatment of psychiatric and neurodegenerative disorders." Nutritional neuroscience 17.4 (2014): 145-155.