The following is from Dr. Schulze 's 2002 Herbal Product Catalog.
Ingredients for Intestinal Formula #3.
Senna leaf and pod, Cascara Sagrada aged bark, Anise seed, Clove bud, Tangerine oil, and California Fig concentrate.
For adults: (Generally if you need over 2 teaspoons then use Intestinal Formula #1.)
For children:
10 to 25 pounds - 1/8 to 1/4 teaspoon
75 to 100 pounds - 3/4 to 1 teaspoon
25 to 50 pounds - 1/4 to 1/2 teaspoon
100 to 150 pounds - 1 to 1 1/2 teaspoons
50 to 75 pounds - 1/2 to 3/4 teaspoon
above 150 pounds 2 or more teaspoons
Kids love the taste, a sweet fig-tangerine flavor, so don't let them drink the whole bottle. Always start the children out with the lower dosages and work your way up to whatever dosage is needed. If your child is not seriously ill it is better to have them constipated one more day than to have cramps, diarrhea or a pooping accident in school from taking too much, which can turn them off from ever using the formula again (and live a life of constipation). So take it easy on the dosage at first.
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I do not know what the proportions are.
You may try going to http://www.healmarketplace.com/. They have a # 3 formula also made from Dr. Schulze 's formula.
Call the 1-800 number and talk to Dara. She may be able to help you with what the proportions are. Her prices are less than Dr. Schulze 's so you my just want to purchase the product from her.
I hope this helps you. Good luck with your son.

Have you had any luck? I looked and looked for the recipe for #3 after I read your post and found nothing. I couldn't even find a place to just buy it. I found #1 and #2 but not #3!! It was very frustrating to me and I don't even need it!!!