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Brand Sensitivity


I've been using 5 HTP and L-Tyrosine for years, along with St. John's Wort, and I keep running into the same trouble. Brands keep changing their suppliers or formula, and suddenly it doesn't work right any more. This leads me on a mad dash, buying every brand I can get in an attempt to find one that feels like the old one.

Has anyone else noticed they are sensitive to brand, regardless of the supplement?

This latest episode was brought about by Source Naturals changing their L-Tyrosine supplier. Would anyone be able to recommend an L-Tyrosine brand that works for them?

Any help would be greatly appreciated. ^^