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Dr. Lin: 9/22/2000>Shorting the erectile Bioelectric circuits in the spinal cord S2-4 with more acetylcholine, retaining a high level of dopamine in the brains, and blocking the stress hormone production and reception will solve your problem. 
Endura (3-006) will help you out.
http://action.love/mail/herbform.htm 
You brain's/nervous acetylcholine system does not produce sufficient acetylcholine in the reflex interneurons of spinal nerves, parasympathetic sexual nerves, and sensory nerves, located inside S2-4.
The brain/spinal nerves must transmit the erectile signals to the parasympathetic sexual (motor) nerves for promotion of erection through your mind, visual, auditory and kissing stimulation.
Or, the sensory nerves from the sex organs couple the sexual stimulation signals into the parasympathetic sexual motor to promote erection. When the nervous endings in the interneuron's synapses can not produce sufficient Acetylcholine for the coupling of the bioelectric acting potential, the erectile bioelectric circuit is temporary shut down. The final action of the erectile circuits is located in the smooth muscles inside the penile or urethral tissues where the erectile neurotransmitter Nitric Oxide (Endothelium-derived relaxing factor) is liberated at the parasympathetic nervous endings and then, after binding to the enzyme guanylate cyclase, converted into the vasodilator cGMP for an abrupt increase of the blood flow in the penile arteries, resulting in corrupting the returning veins to erect the penis. 
To release sufficient acetylcholine, Nitric Oxide and cGMP, you need the essential ingredients and enzymes to let your body do it job. 
Our studies have shown that a lot of drugs, the stress hormone, a high dose of magnesium, a low level of calcium ion, or the over-loaded serotonin can block the signal transmission in the interneurons, even you have a high level of acetylcholine. When you are very stressful, a large amount of stress hormone adrenalin is released in the blood stream from the adrenal medulla, and also produced in the brain (resulting in shoulder and neck pains). As a result, your body consume too much dopamine which is converted to adrenalin. Thus, that is, the brain's dopamine level may become too low to turn on the erectile assistant D2 receptor for muscle relaxation; instead, a high level of adrenalin interferes with the signal transmission in the parasympathetic sexual nerves.