Testosterone Boosters have come a long way in the last few years from a bunch of iffy stuff like weak tribulus and under dosed Long Jack (LJ:100 or 200) to the current quite workable stuff. Monthly new products hit the market, I-Force has just released Intimidate with the hype that it's NMDA ups the effects of DAA by 100 fold. Well, maybe, but perhaps it will be a good to great product. It's new and I have not tried it yet. What I have tried is individual herbs and amminos such as Testofen Fenugreek with 50% Fenuside. This certainly works at medium to high doses. The first time I tried it way back I used 900 mg and the suggested dose was 600 mg. I could feel the difference at 900 mg, but nothing outstanding. Later I tried it at 1200 mg stacked with a low dose A.I., and some other lesser test booster (resveratrol in Sustain Alpha I think), and got very good results. Athletix makes Titanium XL with a standard dose of 1600 mg of the good Fenugreek, and it's backed up with LCLT and I3C at decent doses. I don't consider L-Carnitine-l-Tartrate to be a great stand alone booster, but it backs up others well, and also adding GPLC or just PLC to it makes it a strong Carnitine stack.
There are some products such as HCGenerate by Need to Build Muscle that are outstanding even by themselves. This product has the flagship herb of Fadogia, and they get the premium quality Fadogia that really makes it shine. It also contains 3,4- Divanil at 500 mg to help unbind the test you create. But 500 mg of stinging nettle extract is under dosed, and you can make HCGenerate more effective by adding more Divanil. I did this about a year ago, and actually blood tested results ( I also added a low-dose A.I. and some DAA to this mix). My test results came out over double my poor results of two years before that -- up from 242 to 620, but I was doing a lot of other things right too by this time and focusing on legs and back workouts. I tried to find my records of this, but couldn't, but it doesn't matter as I believe I can do better now.
High dose LJ:100 or 200 seems to work too, especially when stacked with other good boosters, but you need over a gram of the LJ:100 and half that of LJ:200. I have tried 1.2 gms a day and found it quite effective. Google it to find wholesale bulk prices, as it has become much cheaper recently. There have been small studies on this and found it's much more effective on long-term skilled exercisers than newbies (no surprise there).
Biotvia also has a great Fadogia product called Pro Max, that is backed up with Coleus Forskohlii which is another outstanding herb for cutting and boosting at the same time. It elevates cAMP which does many cool things. Coleus Forskohlii is a good herb to use with many boosters or cutting products.
Biotvia also came out with Bioforge earlier which uses Shilajit and Sensoril® (Ashwagandha extract) with large doses of EuryGold (a weaker version of LJ:100). This seems to be potent for many people, but the Shilajit is a pain to take as you must take it away from meals, and should not even eat for a while after for it to be effective.
Erase works too, through just being a strong anti-estrogen, and anti-cortisol. A good transdermal formestane works such as Forma Stanza, it has some cool extras to add to effects, but it's a bit pricey. I like the feel of the Forma Stanza over Erase, but that's my subjective stance, as they both work well.
Fish oil has some decent effects for unbinding test, but does not actually help to create much extra test like coconut oil does. The king of freeing test from SHGB is 3,4-Divanil though, and it essential to either use very high dose fish oil or the stinging nettle extract to unbind test. All test boosting stacks need something to free up the testosterone after it is created. I almost forgot magnesium as a foundation supplement, as many guys are short of this and it has a huge effect on whether or not your hormones are up to snuff. People who get their magnesium in line usually see their DHEA levels increase dramatically.
There are several other good to great boosters out there, but these are a pretty good start.
Rest and recovery, knowing how to workout, and working the lower body a couple times a week will make huge differences in how well these test booster work.