Comparison

St. John's Wort 1.8 g and Full Spectrum St. John's Wort Extract 600 mg

St. John's Wort 1.8 g (SP Standard Process MediHerb) lists 4 distinct ingredients and Full Spectrum St. John's Wort Extract 600 mg (Planetary Herbals) 3 (rows of one ingredient counted once); 3 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 0.59.

Amount per serving (and % of the Daily Value)
IngredientSt. John's Wort 1.8 gFull Spectrum St. John's Wort Extract 600 mg
Calcium80 mg (6%)31 mg (2%)
St. John's Wort300 mg600 mg
Hypericin900 mcg1,500 mcg
Flavonoid glycosides18 mg

Amounts are per serving as DSLD gives them: St. John's Wort 1.8 g, 1 tablet; Full Spectrum St. John's Wort Extract 600 mg, 1 tablet. Current labels entered November 2020 and August 2022. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.

Each product on its own