Looks as if MusclePharm decided to go back to the drawing board on their Testosterone Booster Battle Fuel XT which is a bit odd as most Brands are releasing Fat Burners & Reformulations of their existing fat burners & thermogenics. Even though research is a bit lacking on the effectiveness of Natural Testosterone Supplements we will still give as thorough of a review & as always with No Hype Just Facts!
MusclePharm Battle Fuel Ingredients
Vitamin D – Discovered that men with adequate vitamin D levels had higher testosterone levels compared to those with inadequate vitamin D levels 
Magnesium -study found that magnesium supplement use in tandem with exercise caused a higher testosterone increase compared to those the test subjects who received supplementation without exercise.
Zinc (as Zinc Glycinate) Zinc supplementation for a six-month period caused testosterone levels to increase.
D-Aspartic Acid -D-aspartic acid reacts within the brain to release luteinizing hormone, or LH. LH then travels to the testicles where it enters the specialized cells, or Leydig cells, which have the function of creating testosterone. 
Mucuna Pruriens (50% L-Dopa)- Testosterone has been increased in healthy infertile men without any impairments in seminal parameters following 5g of Mucuna Pruriens extract over 3 months. 
Astaracantha Longifolia Aquatic Extract-Raise Libido & Sexual Performance 
N-Acetyl Carnitine – Has Effects on Androgen Receptors along with resistance training 
Anacylus Pyrethrym – oral doses of Anacyclus root noted increases in testosterone with all dosages 
Curculigo Orchioides– found to have effects on sexual dysfunction and increasing libido. 
Suma Extract 20:1 – improved the subjects with impotency issues sexual desire & performance 
Maca 4:1 – Maca is thought to increase libido, sexual performance and stamina, Maca powder may be used to treat erectile dysfunction.
Propionyl Carnitine– Carnitine has effects on Androgen Rectors when paired with resistance training 
Indole-3-Carbinol– Anti-Estrogenic Properties results in increased test levels with no rebound 
DIM Diindolylmethane-Derivative of Indole-3-Carbinol known for its anti-estrogen effects
Whew leave it to MusclePharm to throw in the Kitchen Sink blend of ingredients but we truly hope this will help you understand some of the reasoning behind adding these ingredients to MusclePharm Battle Fuel and if you are one of those ‘responders’ and these supplements give you an edge than by all means Supplement away. There are only 20 servings per bottle so this is a bit on the low side of the Dose:Dollar scale. All in all this seems like it should be a decent test booster & a fantastic libido aid.
 “Clinical Endocrinology”; Association of Vitamin D Status With Serum Androgen Levels in Men; E. Wehr et al.; August 2010 http://www.ncbi.nlm.nih.gov/pubmed/20050857
 “Biological Trace Element Research”; Effects of Magnesium Supplementation on Testosterone Levels of Athletes and Sedentary Subjects at Rest and After Exhaustion; Cinar V, et al.; April 2011 http://www.ncbi.nlm.nih.gov/pubmed/20352370
 “Reproductive Biology and Endocrinology”; Opposing Effects of D-aspartic acid and Nitric Oxide on Tuning of Testosterone Production in Mallard Testis During the Reproductive Cycle; Maria Di Fiore; July 2008 http://www.doaj.org/doaj?func=abstract&id=276013&openurl=1&uiLanguage=en
 “Fertility and Sterility”; Mucuna pruriens improves male fertility by its action on the hypothalamus-pituitary-gonadal axis; KK Shukla et al; December 2009 http://www.ncbi.nlm.nih.gov/pubmed/18973898
 Saadiah Abdul Razak H, Shuid AN, Naina Mohamed I. Combined Effects of Eurycoma longifolia and Testosterone on Androgen-Deficient Osteoporosis in a Male Rat Model. Evid Based Complement Alternat Med. (2012) http://www.ncbi.nlm.nih.gov/pubmed/22924057
 Medicine and Science in Sports and Exercise: Androgenic Responses to Resistance Exercise – Effects of Feeding and L-Carnitine http://www.ncbi.nlm.nih.gov/pubmed/16826026
 Sharma V, et al. Androgenic and Spermatogenic Activity of Alkylamide-Rich Ethanol Solution Extract of Anacyclus pyrethrum DC. Phytother Res. (2012) http://www.ncbi.nlm.nih.gov/pubmed/22473789
 Effect of Curculigo orchioides on hyperglycemia-induced oligospermia and sexual dysfunction in male rats International Journal of Impotence Research (2012) published online 15 September 2011. www.nature.com/ijir/journal/v24/n1/full/ijir201143a.html
 “Journal of Reproductive Development”; Pfaffia paniculata-induced Changes in Plasma Estradiol-17beta, Progesterone and Testosterone Levels in Mice; M. Oshima and Y. Gu; 2003 http://www.ncbi.nlm.nih.gov/pubmed/14967943
 University of California-Berkeley: Chalk up Another One for Broccoli! Chemical in Vegetable Shown to Halt Growth of Breast Cancer Cells; Robert Sanders; Feb. 20, 1998 http://berkeley.edu/news/media/releases/98legacy/02_20_98a.html