The most commonly used AAS in medicine are testosterone and its various esters (but most commonly testosterone undecanoate , testosterone enanthate , testosterone cypionate , and testosterone propionate ),  nandrolone esters (most commonly nandrolone decanoate and nandrolone phenylpropionate ), stanozolol , and metandienone (methandrostenolone).  Others also available and used commonly but to a lesser extent include methyltestosterone , oxandrolone , mesterolone , and oxymetholone , as well as drostanolone propionate , metenolone (methylandrostenolone), and fluoxymesterone .  Dihydrotestosterone (DHT; androstanolone, stanolone) and its esters are also notable, although they are not widely used in medicine.  Boldenone undecylenate and trenbolone acetate are used in veterinary medicine . 
Don’t waste your time and money on a legal testosterone boosters, they may only increase testosterone production by extremely minuscule amounts, nothing that will even begin to produce any noticeable androgenic effects that will lead to secondary male characteristics such as beard growth. You would genuinely have more luck using something like minoxidil which actually stimulates hair follicles and encourages vellus hairs to transition into terminal hairs. At the end of the day, we all know what’s going to provide the most bang for your buck, it’s actual fucking testosterone and trenbolone, one of the most androgenic steroids which the Germans graced us with 30 odd years ago.