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This happens because the body's production of testosterone slows over time, and the development of fat on men causes an increased production of estrogen, a female hormone. Like their name suggests, testosterone boosters are dietary supplements containing one or more ingredients that support the production, release or activity of the androgenic (masculine) hormone testosterone. 4 Dimension Nutrition Tribulus 800, AI Sports Nutrition Massularia, AI Sports Nutrition Stoked, AllMax Nutrition TribX 90, AllMax Nutrition ZMA, Applied Nutriceuticals Beta Test, Applied Nutriceuticals Free Test XRT-Caffeine Free, AST DHEA 100, Axis Labs MYODEX, Better Body Sports Testify, Biotivia BioForge, Blue Star Nutraceuticals Status, Blue Star Nutraceuticals Trib XD, Foundation Series Tribulus Terrestris, BPI Sports A-HD Elite, BPI Sports PRO-HD, Cellucor COR-Performance ZMA, Cellucor P6 PM, Controlled Labs Blue Gene, Controlled Labs Blue Up, Controlled Labs Blue Up - Stim Free, Core Nutritionals Hard, Cutler Nutrition Big T, Cutler Nutrition DRY, DreamBrands Mdrive Classic, DreamBrands Mdrive Prime, Dymatize Z-Force, EPIQ Quad Test, EVLUTION NUTRITION Z-Matrix, Fountain Of Youth HGH Complete (capsules, powder), FUSION BODYBUILDING SHUT-EYE, Gaia Herbs Male Libido, Gamma Labs Gamma-, GAT JetFUEL T-300, GAT Mens Multi+Test, GAT Tribulus, Genomyx Tribulus, Healthy ‘N Fit Advanced Steroidal Complex, Healthy ‘N Fit DHEA, iForce Nutrition Intimidate SRT, iForce Nutrition Tropinol XP, Infinite Labs Cyclo Bolan NT, Infinite Labs Cyclo Test, Infinite Labs Pro DHEA, Infinite Labs Pro Tribulus, Infinite Labs Pro Z, Infinite Labs Tribulus, Inner Armour TEST PEAK, Inner Armour Tribulus Elite, Irwin Naturals Steel-Libido, Irwin Naturals Testosterone UP, JYM ZMA JYM, Kaizen DHEA 100, Kaizen ZMA PM, Labrada HumanoGrowth, Lecheek Nutrition AD-3, Life Extension Super Miraforte With Standardized Lignans, LiveLong Nutrition Forskolin, LiveLong Nutrition Icariin, Magnum Nutraceuticals Tonic, MAN N-XT, Mass Machine Nutrition MM90 ZMA, MET-Rx Tribulus 750, MET-Rx Tribulus Max, MET-Rx ZMA, Metabolic Diet GHboost Version-4, Metabolic Diet TestoBoost, MHP 5D Tropin, MMUSA T, MRM DHEA, MRM Tribest 750, MRM TribuPlex 750, MuscleMeds Methyl Arimatest, Muscleology RedTest, MusclePharm Z-Core PM, MuscleTech TEST HD, Myokem ALPHADEX , Myokem MAGNITROPIN, Natrol DHEA, Neogenix Supremacy 2.0, Novex Biotech ThermoDyne, NOW Men's Virility Power, NOW TestoJack 100, NOW TestoJack site 200, NOW Tribulus, NOW Tribulus 1000, NOW ZMA, Nutraceutics DHEA MAX, Nutraceutics Testron SX, OhYeah!