B 
Vitamin B3 (as Niacin or Niacinimide), 
Vitamin B6
Vitamin B12
Butea Superba (from Thailand also known as Red Kwao Krua) A potent forest grown herb used for various health issues including diabetes and hypertension but particularly for the inhibitory effect towards cAMP phosphodiesterase that allows for improvement of vasodilation in the penis.
 
C
Cayenne Pepper: A hot pepper that increases blood flow and heart rate similar to a rush of sexual desire and also resembles a tumescent penis.
Catuaba Bark: Bark from a Rainforest tree considered a central nervous system stimulant as well as for nervousness, poor memory, and sexual weakness.
Chrysin
Cnidium Monnier,
Cordyceps sinensis is a medicinal mushroom used in traditional Chinese medicine for male impotence and other types of sexual dysfunction. CS-4 has been tested extensively for other treatments including enhanced immune functions.

D
Damiana is a common aphrodisiac in Mexico.
DHEA (AKA Dehydroepiandrosterone): Steroid produced by adrenal glands, but taken as a supplement to help restore the natural age-related decline. Reports indicate DHEA increases sexual energy in both men and women and may alleviate male impotence.

E
Eleuthero (Siberian Ginseng),
Epimedium Sagitatum (Horny Goad Weed, Ying Yang Huo), Chinese herb with history as aphrodisiac
Eurycoma Longifolia: Aphrodisiac from Pacific Rim. See Long Jack. 
Elk Velvet Antler

G
Ginseng (Panax Ginseng, Chinese, Ren Shen) The best known remedy for impotence and premature ejaculation.
Glutamic Acid HC1,
Gotu Kola is used for many conditions including improving circulation, anti-aging and alertness. A common aphrodisiac.
Ginko Biloba is a widely used herb for improving circulation, memory and for its antioxidant properties.
Ginger extract,
Gaba (Gamma Amino Butyric Acid)

H
Horny Goat Weed (AKA Epimedium, Ying Yang Huo): Chinese aphrodisiac 
Horse Chestnut

I
Icariin: A substance found in herbs such as Horny Goat Weed/ Epimedium recognized for its role in dilating blood vessels and potential treatment for erectile dysfunction.
L

L-Argenine: An amino acid that promotes male fertility. (see Argenine) 
L Alanine,
L Lysine,
Licorice
Long Jack, LongJax,(AKA Eurycoma Longifolia Jack, AKA Tongkat Ali, Pasak Bumi): An evergreen shrub found in Malaysia, Burma, Indochina, Thailand, Sumatra, Borneo, and the Phillipines  used primarily as an antimalarial, antipyretic, antiulcer, cytotoxic as well as a legendary testosterone enhancement.
Lepidium meyenii maca extract

M
Maca Root Extract 4:1 (Lepidium Meyenii),
Mucuna Pruriens (includes high amt of L-Dopa)
Muira Puama