Use this guide to figure a formula:
ONE OR BOTH:
ANY OR ALL OF THE FOLLOWING:
John the Conqueror root
ARE USUALLY ADDED:
Alkanet, or other red dye
Also, if there is a desired target, sometimes a paper with the name of the target is put into the container. Additionally, one or two small lodestones are sometimes added to the mix.
And yet, be this instruction inadequate for you, I provide you the following recipes:
COME TO ME, recipe A
This is modeled on the "sweetpea" recipe for Come to Me, favored by some people and said by one practitioner to "attract just about everybody in the human race." According to the 1892 book Perfumes and their Preparation, this is the recipe for the mixture sold as Sweetpea (the actual plant, evidently, cannot produce a stable oil and so its scent is available only in blended imitations) -- and seems to be itself a most suitable oil combination.
COME TO ME, recipe B
This recipe as been making the rounds on the internet, and is often the first one comes across. The inclusion of lemon is a little unusual, since it is usually a cleansing ingredient (the above list only has it because of this recipe, and its proliferance.) This is actually the mixture sold by many companies as Come to Me oil, and there is a preference among some for adding citrus oils to their mixtures to improve the fragrance. I believe at least one popular occult supplier uses this recipe with the addition of some of the roots and spices listed above left to float in the bottle.