You have to start with a mother tincture that takes the extract from the source (plant, animal, or mineral) and dissolves it in an alcohol and distilled water concentration. This concoction is succussed (shaken) and then sits for a period of time. Then it is strained and used as the mother tincture.
The mother tincture is diluted and succussed a number of different times to reach an optimal potency. The optimal potency will differ per homeopathic remedy and slightly per person. Companies use the dilution rate that should be the most effective for the majority of the population.
How you read the dilution rate is 1x means 1 drop of the mother tincture per 10 drops of alcohol/distilled water. 2X means the solution has been diluted 2 times and succussed 2 times. The more dilutions and succussions you have the deeper and more potent the homeopathic remedy will be. By deeper I mean hitting you at a different cellular level.
Now to totally confuse the situation when you take a product like MHP HCG Remedy it contains a variety of homeopathic remedies combined at different dilutions in one bottle. This treats a few different areas of the body. This helps with energy and appetite. But MHP HCG 12X only has HCG diluted and succussed 12 times.
We have general rules we follow such as a person who has done HCG numerous times most likely will need a higher concentrations therefore the 60X is the best choice. An active person will need additional supplements so Remedy is the better bet and a person who is less active should go for the 12x.
For more information on homeopathic remedies visit sites such as Society of Homeopathy