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…oms can—and cannot—tell you There is no established dietary deficiency syndrome for this specific botanical or compound. Symptoms are not evidence that you need this supplement. Food sources Trace amounts occur in foods such as mushrooms, g…

…ts vision, immune function and tissue development. Possible deficiency symptoms Deficiency can cause night blindness and eye-surface damage. How supplementation is approached Distinguish preformed vitamin A from beta-carotene and review exi…

…od into usable energy and supports nerve function. Possible deficiency symptoms Severe deficiency can cause weakness, nerve problems, confusion and heart problems. How supplementation is approached Review thiamine within food intake, digest…

…ings and clinical history help determine whether there is a deficiency or another issue. A genetic tendency alone does not settle the diagnosis or the best formulation. How supplementation is approached Dr. Purser distinguishes methylcobala…

…may matter, but an MTHFR result does not prove a riboflavin deficiency or tell you a dose. Include any B-complex or multivitamin you already take when you review your options. How supplementation is approached Dr. Purser connects riboflavin…

…P, which participate in cellular energy reactions. Possible deficiency symptoms Severe deficiency causes pellagra, which can involve skin, digestive and neurological symptoms. How supplementation is approached Identify whether the product c…

… folate. A methylation label does not replace evaluation of deficiency. Food sources Leafy greens; lentils; chickpeas; asparagus; citrus; fortified grains. Supplement forms Folic acid, folinic acid and 5-MTHF (methylfolate) are different fo…

…tioxidant activity and absorption of nonheme iron. Possible deficiency symptoms Severe deficiency can cause bleeding gums, easy bruising, poor wound healing and fatigue. How supplementation is approached Review vitamin C intake, the actual …

… results together. A VDR variant does not by itself prove a deficiency or set a dose. How supplementation is approached Dr. Purser’s plan reviews vitamin D as a fat-soluble nutrient and separates a VDR gene finding from the measured vitamin…

…ns involved in blood clotting and bone metabolism. Possible deficiency symptoms Deficiency can cause abnormal bleeding; it needs clinical evaluation. How supplementation is approached Vitamin K1 is part of the vitamin K and clotting discuss…

…APA result. A cell-response finding is not a diagnosis of a deficiency in this botanical or compound. Wild-cherry-bark preparations are distinct from cherry fruit foods. Do not substitute homemade bark preparations for a reviewed product. …

…ntioxidant-response category does not diagnose a zeaxanthin deficiency or set a treatment schedule. What symptoms can—and cannot—tell you There is no established dietary deficiency syndrome for this specific botanical or compound. Symptoms …