C
Unclear or conflicting scientific evidence
- Acupuncture
: There has been limited research on acupuncture for sexual dysfunction. Currently there is inadequate available human evidence to recommend for or against acupuncture in the treatment of erectile dysfunction. There is inconclusive evidence in support of acupuncture for infertility. There is, however, some support for use of electroacupuncture for pain relief during assisted reproduction therapy, and it may hold some promise for improving pregnancy rates. Additional high quality research is needed in this area.
- Astaxanthin
: There is currently insufficient available evidence to recommend for or against the use of astaxanthin for male fertility. Additional study is needed in this area.
- Coenzyme Q10
: There is early evidence that supports the use of CoQ10 in the treatment of increasing sperm count and motility. Better studies are needed before a strong recommendation can be made.
- DHEA
: DHEA supplementation may be beneficial in women with ovulation disorders. There is currently not enough scientific evidence to form a clear conclusion about the use of DHEA for this condition. Preliminary evidence suggests that DHEA may offer some benefit to individuals with erectile dysfunction. Well-designed clinical trials, with appropriate endpoints are required before recommendations can be made.
- Dogwood
: In limited available study, a traditional Chinese herbal combination containing dogwood seems to have helped with postmenopausal levels of follicle stimulating hormone and luteinizing hormone in order to achieve pregnancy. Although this result is interesting, further research is needed in this area.
- Green tea
: Early research using a combination product called FertilityBlendâ„¢ has been associated with some success in helping women to conceive. Further well-designed research on green tea alone for this use is needed before a conclusion can be drawn.
- Hypnosis
: Based on early evidence, hypnosis may improve the in vitro fertilization-embryo transfer cycle. Additional study is needed before a firm conclusion can be drawn.
- L-Carnitine
: Early evidence shows a positive effect for carnitine and/or acetyl-L-carnitine in terms of increased sperm motility. However, additional study is needed before a firm conclusion can be made.
- Lycopene
: Based on early study, taking lycopene seems to have a role in the management of idiopathic male infertility. Further research is needed to confirm these results.
- Maca
: Maca has been traditionally used in Peru to enhance fertility of both people and animals. Maca may improve semen quality; however, additional study is needed to confirm this finding.
- Prayer
: The potential effect of intercessory prayer on pregnancy rates in women being treated with in vitro fertilization-embryo transfer has been studied. Preliminary results seem positive, but further research is necessary.
- Psychotherapy
: Group and individual/couple psychotherapy may reduce depression and anxiety associated with infertility. However, psychotherapy may not improve fertility rates. More and better-designed studies are needed in this area.
- Pycnogenol
: Human studies report that Pycnogenol® may improve sperm quality and function in sub-fertile men. Further research is needed to confirm these results.
- Selenium
: Selenium supplementation has been studied for male infertility and sperm motility with mixed results. Evidence is currently lacking regarding potential effects on female infertility.
- Tribulus
: Although results from early investigating the effects of Tribulus terrestris are encouraging, larger studies of better design are needed in order to evaluate the effectiveness of Tribestan® in treatment of female infertility. Although Tribestan® seems to increase sperm count and viability and increase libido, its effectiveness in the treatment of male infertility remains inconclusive, due to a lack of well-designed clinical trials.
- zinc
: Many studies report beneficial results of zinc supplements on infertility, as expressed in improved sperm quality and number, although this effect may depend on the cause of infertility. A minor increase in abnormal spermatozoa in subfertile males taking zinc was noted in limited study. Additional research is needed before a firm conclusion can be drawn.
D
Fair negative scientific evidence
- Arginine
: Although there are several studies in this area, it is not clear what effects arginine has on improving the likelihood of getting pregnant. Early evidence does not support the finding that arginine has any benefits in women who are undergoing in vitro fertilization or in men with abnormal sperm.
- Probiotics
: Probiotics have been used in the vagina immediately after oocyte retrieval during IVF, but they do not appear to have an effect on vaginal colonization or pregnancy rate in IVF cycles.