Douglas Laboratories L-Histidine

• Sourcing – Call center advised plant based via fermentation
• Label Transparency – No sourcing or manufacturing details and no certification shown

NOTE: The label claims that it is preservative-free, which is true of all low-moisture sealed pre-packaged supplements.

• Manufacturing Process – Plant based fermentation from corn
• Lab Testing – This product is pharmaceutical grade, which means that the ingredients are over 99% in purity and contain no unknown additives. This certification requires stringent testing.
• Certifications – although not on label call center advised non-GMO and Vegan certified, contains no allergens as per list, yeast, wheat, gluten, soy protein, milk/dairy, corn, sodium, sugar, starch, artificial coloring, flavoring.