Tongkat Ali (Eurycoma Longifolia):
Phytoandrogenic properties of Eurycoma longifolia as natural alternative to testosterone replacement therapy. http://www.ncbi.nlm.nih.gov/pubmed/24386995
Eurycomanone, the major quassinoid in Eurycoma longifolia root extract increases spermatogenesis by inhibiting the activity of phosphodiesterase and aromatase in steroidogenesis. http://www.ncbi.nlm.nih.gov/pubmed/23810842
Standardized quassinoid-rich Eurycoma longifolia extract improved spermatogenesis and fertility in male rats via the hypothalamic-pituitary-gonadal axis. http://www.ncbi.nlm.nih.gov/pubmed/23261482
Effect of Tongkat Ali on stress hormones and psychological mood state in moderately stressed subjects. http://www.ncbi.nlm.nih.gov/pubmed/23705671
Standardised water-soluble extract of Eurycoma longifolia, Tongkat ali, as testosterone booster for managing men with late-onset hypogonadism? http://www.ncbi.nlm.nih.gov/pubmed/21671978
Influence of Eurycoma longifolia on the copulatory activity of sexually sluggish and impotent male rats. http://www.ncbi.nlm.nih.gov/pubmed/19703544
The effect of Eurycoma longifolia on sperm quality of male rats. http://www.ncbi.nlm.nih.gov/pubmed/19911566
Effects of Eurycoma longifolia Jack (Tongkat Ali) on the initiation of sexual performance of inexperienced castrated male rats. http://www.ncbi.nlm.nih.gov/pubmed/10803359
The in vitro and in vivo anti-cancer activities of a standardized quassinoids composition from Eurycomalongifolia on LNCaP human prostate cancer cells. http://www.ncbi.nlm.nih.gov/pubmed/25826409
In vivo effects of Eurycoma longifolia Jack (Tongkat Ali) extract on reproductive functions in the rat. https://www.ncbi.nlm.nih.gov/pubmed/23464350
Eurycoma longifolia as a potential alternative to testosterone for the treatment of osteoporosis: Exploring time-mannered proliferative, differentiative and morphogenic modulation in osteoblasts. https://www.ncbi.nlm.nih.gov/pubmed/27818256
Grapeseed extract:
Grape seed extract is an aromatase inhibitor and a suppressor of aromatase expression. http://www.ncbi.nlm.nih.gov/pubmed/16740737
Suppression of estrogen biosynthesis by procyanidin dimers in red wine and grape seeds. http://www.ncbi.nlm.nih.gov/pubmed/14679019
Effects of grape seed polyphenols on oxidative damage in liver tissue of acutely and chronically exercised rats. http://www.ncbi.nlm.nih.gov/pubmed/22745005
Grape seed extract enhances eNOS expression and NO production through regulating calcium-mediated AKT phosphorylation in H2O2-treated endothelium. http://www.ncbi.nlm.nih.gov/pubmed/20513234
Effect of grape seed extract on blood pressure in subjects with the metabolic syndrome. http://www.ncbi.nlm.nih.gov/pubmed/19608210
The effect of grape seed extract on cardiovascular risk markers: a meta-analysis of randomized controlled trials. http://www.ncbi.nlm.nih.gov/pubmed/21802563
Effects of grape seed extract consumption on platelet function in postmenopausal women. http://www.ncbi.nlm.nih.gov/pubmed/17950783
Effects of marjoram volatile oil and grape seed extract on ethanol toxicity in male rats. http://www.ncbi.nlm.nih.gov/pubmed/17910615
D-AA:
The role and molecular mechanism of D-aspartic acid in the release and synthesis of LH and testosterone in humans and rats http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2774316/
D-Aspartic acid: an endogenous amino acid with an important neuroendocrine role. http://www.ncbi.nlm.nih.gov/pubmed/17118457
Involvement of D-aspartic acid in the synthesis of testosterone in rat testes. http://www.ncbi.nlm.nih.gov/pubmed/8699926
Boron:
Comparative effects of daily and weekly boron supplementation on plasma steroid hormones and proinflammatory cytokines. http://www.ncbi.nlm.nih.gov/pubmed/21129941
The effect of boron supplementation on its urinary excretion and selected cardiovascular risk factors in healthy male subjects. http://www.ncbi.nlm.nih.gov/pubmed/9197924
The significance of dietary boron, with particular reference to athletes. http://www.ncbi.nlm.nih.gov/pubmed/10376277
Nothing Boring About Boron. http://www.ncbi.nlm.nih.gov/pubmed/26770156
Vitamin D:
Association of vitamin D status with serum androgen levels in men. http://www.ncbi.nlm.nih.gov/pubmed/20050857
Plausible ergogenic effects of vitamin D on athletic performance and recovery. http://www.ncbi.nlm.nih.gov/pubmed/26288575
Effect of vitamin D supplementation on testosterone levels in men. http://www.ncbi.nlm.nih.gov/pubmed/21154195
Hip fracture in elderly men: the importance of subclinical vitamin D deficiency and hypogonadism. http://europepmc.org/abstract/med/9734509
Association between plasma 25-OH vitamin D and testosterone levels in men http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2265.2012.04332.x/abstract?deniedAccessCustomisedMessage=&userIsAuthenticated=false
INFLUENCE OF ULTRAVIOLET IRRADIATION UPON EXCRETION OF SEX HORMONES IN THE MALE1 http://press.endocrine.org/doi/pdf/10.1210/endo-25-1-7
Vitamin D is positively associated with sperm motility and increases intracellular calcium in human spermatozoa. http://www.ncbi.nlm.nih.gov/pubmed/21427118
Vitamin D is necessary for reproductive functions of the male rat. http://www.ncbi.nlm.nih.gov/pubmed/2723823
Males with low serum levels of vitamin D have lower pregnancy rates when ovulation induction and timed intercourse are used as a treatment for infertile couples: results from a pilot study. http://www.ncbi.nlm.nih.gov/pubmed/26589555
Zinc:
Zinc status and serum testosterone levels of healthy adults. http://www.ncbi.nlm.nih.gov/pubmed/8875519
The effect of exhaustion exercise on thyroid hormones and testosterone levels of elite athletes receiving oral zinc. http://www.ncbi.nlm.nih.gov/pubmed/16648789
Effect of fatiguing bicycle exercise on thyroid hormone and testosterone levels in sedentary males supplemented with oral zinc. http://www.ncbi.nlm.nih.gov/pubmed/17984944
Impact of oral zinc therapy on the level of sex hormones in male patients on hemodialysis. http://www.ncbi.nlm.nih.gov/pubmed/20446777
Effect of zinc administration on plasma testosterone, dihydrotestosterone, and sperm count. http://www.ncbi.nlm.nih.gov/pubmed/7271365