Comparison

2-Phase Dual Immune Booster and Source Of Life Immune Booster

2-Phase Dual Immune Booster (Royal Guard) lists 10 distinct ingredients and Source Of Life Immune Booster (Nature's Plus) 10 (rows of one ingredient counted once); 10 are on both labels. On the site's similarity measure, which compares ingredient lists (1 for the same list, rarer ingredients counting for more; amounts are not part of it), the two formulas score 1.00: the same ingredients, at the amounts in the table below.

Amount per serving (and % of the Daily Value)
Ingredient2-Phase Dual Immune BoosterSource Of Life Immune Booster
Vitamin C167 mg (186%)500 mg (556%)
Zinc5 mg (45%)15 mg (136%)
Vitamin E20 IU60 IU
Vitamin A3,333 IU10,000 IU
Lactobacillus acidophilus0.33 mg1 mg
Olive25 mg75 mg
Echinacea angustifolia17 mg50 mg
Arabinogalactan83 mg250 mg
Andrographis17 mg50 mg
American Elder17 mg50 mg

Amounts are per serving as DSLD gives them: 2-Phase Dual Immune Booster, 1 tablet; Source Of Life Immune Booster, 3 tablets. Current labels entered November 2012 and October 2012. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.

Each product on its own