Supplements > Phenylalanine > Warnings Supplements with Similar Warnings as: Phenylalanine Below is a list of conditions where patients are warned against taking this supplement. Under each condition is listed other supplements with similar warnings.   phenylketonuria (PKU) Spirulina pregnancy 5-Hydroxytryptophan (5-HTP) Alpha-Lipoic Acid Beta-Carotene Bromelain Cartilage Chondroitin Coenzyme Q10 Docosahexaenoic Acid (DHA) Eicosapentaenoic Acid (EPA) Gamma-Linolenic Acid (GLA) Melatonin Omega-6 Fatty Acids Red Yeast Rice S-Adenosylmethionine (SAMe) Spirulina Sulfur Vitamin A (Retinol) Vitamin C (Ascorbic Acid) Vitamin K

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