Several supplements are reported as increasing testosterone by 40-50% – these include resveratrol, garlic extract, olive oil & other specific lipids and several others so one would expect that taking these supplements together would cause an even greater increase.

Pantocrine deer antler extract is also purported to substantially increase testosterone – this may be linked to IGF increasing gonad size & function.

From an older post:

Testosterone & Growth factor Tincture – daily dose

Tienchi Ginseng : 1/3 teaspoon x3 per day
Pine Pollen tincture : 1 teaspoon per day
Nettle Root : 1200 mg per day
Tribulus : 500 mg per day
Panax Ginseng : 1/4 teaspoon per day
Siberian Ginseng : 1 teaspoon x2 per day

The above formula can be taken daily indefinitely

To be cycled 3 weeks on 1 week off …

Pantocrine – deer antler extract : 4-10 droppers per day depending on your weight

OK but the two biggies are Onion Juice & Ginger extract. Onion juice has shown a 3x increase in testosterone in rats at a small dose equal to 50 ml per day for a human. Ginger extract has shown a doubling of testosterone.

By using these both the studies suggest a substantial increase in testosterone may occur. As always anti estrogenics will be required.