Introduction: 

Often called "Peruvian Ginseng", Maca is a unique root tuber with usage dating
back to the mid 15th century. Natives of this area ate it raw, cooked or boiled
and it became a staple in their everyday diet. Contrary to some literature
citing its use some 2000 years ago to tout sexual stamina, this is hardly
correct. Truth is, the rough terrain of this region made it difficult to
cultivate food so most of the communities diet was dependant on wild gathered
material, hence the Maca was incorporated into their daily food consumption. It
resembles a radish and is actually a close relative as well. The growing
conditions are very specific and it will only thrive in the glaciated slopes of
the Andes with a prime elevation of 12,000 to 15,000 feet above sea level.
Currently the country of Peru is heavily subsidizing and studying the benefits 
of this root and several reports from educational and scientific institutions
have showed significant (120-200%) increases in sexual endurance, physical
stamina, adaptability to stressful situations and an increase in both the number
and activity of spermatazoids (sperm). While this information has not been
thoroughly reviewed or studied much outside of Peru, the users' testimonies for
the last several years are notable.

Constituents:  High in
minerals (calcium, potassium, iron, magnesium, phosphorus, and zinc), sterols (6
found), up to 20 essential fatty acids, lipids, fiber, carbohydrates, protein,
and amino acids.

Parts Used:  The whole powdered or sliced root in
either raw or roasted form. The maca powder offered by Mountain Rose Herbs is
raw.

Typical Preparations:  The whole root can be eaten raw,
sliced, cooked, boiled or baked. Currently Western users utilize it in the form
of a medicinal drink made from the powder or, taken in the form of tablets,
capsules, and as a liquid extract. It can be easily and safely sprinkled in
culinary dishes.

Summary:  Not much research has been carried out
for this particular botanical out of its native country Peru, but several
distinguished journals and scientists worldwide have supported what the Peruvian
researchers have done and the preliminary studies they published. Maca root is
being effectively administered to both men and women to help increase libido,
men's sperm activity, and to assist both sexes with issues regarding their
physical endurance and threshold. Most Maca roots are being wildharvested and we
foresee grave danger for the safety and sustainability of this botanical. Trial
cultivation plots are under way; attempting to address the situation. With any
luck we will see an increase of imported Maca from this source. As with all
potentially endangered plants, consume consciously.

Precautions: 
To date no record of any contraindications, adverse effects, or toxicity have
been found.

For educational
purposes only This information has not been evaluated by the Food and Drug
Administration.
This information is not intended to diagnose, treat, cure, or
prevent any disease.

Source:
http://www.mountainroseherbs.com/learn/macaroot.php

In videos 1-6 Lilou Mace interviews Dr. John Demartini.