An approach that has been taken is to try and increase melanin production by increasing MSH activity. This seems very obvious - just give more of this hormone, and skin should darken. In fact, MSH analogues have been derived that are effective in this regard.
www.madsci.org/posts/archives/may98/894467060.Me.r.html
I saw this segment on a health medicine show where a man was given a series of injections over a matter of time and gradually his skin became darker. I was not sure if it was melanin or something else. ... The amount of melanin in the body is difficult to produce, ... I am a fair person who's always wanted to have a dark skin.
www.nutritionalsupplements.com/melanin.html www.nutritionalsupplements.com/melanin.html
Phosphorylated mixed isomers of L-dopa increase melanin content in ...; By these criteria, dopa phosphates and UVB act in a similar manner to increase melanin content in the skin. ... Increasing... melanin, a skin pigment, to protect the skin from the sun's ultraviolet (UV) light. Melanin is an amazingly powerful...
www.wellsphere.com/wellpage/increase-melanin www.wellsphere.com/wellpage/increase-melanin
A composition and method useful for increasing the accumulation of melanin in the skin of humans and other mammals wherein the composition comprises at least one O-phosphorylated derivative of 3-(3,4- ... We claim: 1. A composition for increasing melanization in the epidermis of a mammal comprising the admixture of...
www.freepatentsonline.com/4508706.html
Melanin - Wikipedia, the free encyclopedia
Melanin (Greek μέλας, black ; pronounced /ˈmɛlənɪn/  ( listen) ) is a class of compounds found in plants, animals, and protists, where it serves predominantly as a pigment. The class of pigmen...
en.wikipedia.org/wiki/Melanin
Its major role in the skin is to absorb the ultraviolet (UV) light that comes from the sun so the skin is not damaged. Sun exposure usually produces a tan at the skin that represents an increase of melanin pigment in the skin.
www.newton.dep.anl.gov/askasci/bio99/bio99834.htm
Question: How does the skin produce melanin? Janae Lepir Answer: There are special cells in the skin called melanocytes. They synthesize melanin from an amino acid, tyrosine. (Amino acids make up proteins; there are about 20 different ones).
www.newton.dep.anl.gov/askasci/bio99/bio99428.htm
The latter two variables are more important in determining skin color than the percentages of the different kinds of melanin. In lighter skin, color is also affected by red cells in blood flowing close to the skin.
anthro.palomar.edu/adapt/adapt_4.htm
Solaire Natural Tan Activator helps maintains by increasing your bodies melanin production naturally. Your tan will last longer while conditioning your skin to give you the look you expect.
www.bluespringwellness.com/healthyskin_tanning_solaire www.bluespringwellness.com/healthyskin_tanning_solaire
Exposing your skin to ultraviolet radiation stimulates melanin-producing cells. With increasing amounts of melanin you skin darkens. This tanning provides a protection against UV radiation damage.
cimss.ssec.wisc.edu/wxwise/class/uvpretst.htm