RE: Gripe about
Amy,
I think the reason that some companies see grapefruit seed extract as an ingredient to be avoided is because there are several studies that have determined that the only reason grapefuit seed extract has antimicrobial activity is because it is often doctored with synthethic preservatives, including parabens. I've pasted one such study below. I suspect that one of the ingredients in the Home Health deodorant is the source and it could very well be the grapefruit seed extract.
This abstract is from PubMed.
Von Woedtke T, Schluter B, Pflegel P, Lindequist U, Julich WD. Institute of Pharmacy, Ernst Moritz Arndt University, Greifswald, Germany. Aspects of the antimicrobial efficacy of grapefruit seed extract and its relation to preservative substances contained. Pharmazie 1999, Jun:54(6):452-6
The antimicrobial efficacy as well as the content of preservative agents of six commercially available grapefruit seed extracts were examined. Five of the six extracts showed a high growth inhibiting activity against the test germs Bacillus subtilis SBUG 14, Micrococcus flavus SBUG 16, Staphylococcus aureus SBUG 11, Serratia marcescens SBUG 9, Escherichia coli SBUG 17, Proteus mirabilis SBUG 47, and Candida maltosa SBUG 700. In all of the antimicrobial active grapefruit seed extracts, the preservative benzethonium chloride was detected by thin layer chromatography. Additionally, three extracts contained the preserving substances triclosan and methyl parabene. In only one of the grapefruit seed extracts tested no preservative agent was found. However, with this extract, as well as with several self-made extracts from seed and juiceless pulp of grapefruits (Citrus paradisi), no antimicrobial activity could be detected (standard serial broth dilution assay, agar diffusion test). Thus, it is concluded that the potent as well as nearly universal antimicrobial activity being attributed to grapefruit seed extract is merely due to the synthetic preservative agents contained within. Natural products with antimicrobial activity do not appear to be present.