Mineral Supplementation in Greenville, SC
Mineral Supplementation at IHP Greenville. Dr. Hendry, DAOM — functional medicine, root-cause diagnostics, personalized care. Call (864) 365-6156.
Serum magnesium is maintained within a narrow range by pulling magnesium from cells and bone — which means the serum result can be normal until the final 1% of body stores are depleted. The patient with fatigue, insomnia, muscle cramping, constipation, and anxiety who has "normal" magnesium has not had the right test ordered. RBC magnesium reflects intracellular status accurately. I use RBC magnesium, not serum, for the same reason I use RBC zinc and not serum zinc. Gärtner showed that selenium 200 mcg reduced TPO antibodies by 40% in Hashimoto's patients — but you can't identify who needs it without testing. Ferritin below 50 ng/mL causes fatigue through impaired thyroid peroxidase activity and mitochondrial iron-sulfur cluster assembly even when hemoglobin is completely normal. The right test, on the right specimen, is what finds what's actually wrong.
How Mineral Supplementation Works
Mineral assessment at IHP typically includes: magnesium (RBC magnesium — more accurate than serum), zinc (serum or RBC), selenium (for thyroid and immune function), iron studies including ferritin (for iron stores, separate from hemoglobin), and copper (for patients taking zinc, which depletes copper). Supplementation is targeted to identified deficiencies at therapeutic doses from professional-grade sources.
Conditions Treated with Mineral Supplementation
Targeted Mineral Repletion vs. the Multivitamin Approach
Standard multivitamins address the theoretical concern of mineral insufficiency by providing a broad array of nutrients at doses calibrated to meet Recommended Daily Allowances — levels established to prevent classical deficiency diseases such as scurvy or pellagra in otherwise healthy populations, not to support therapeutic repletion in clinically deficient patients. A patient presenting with muscle cramps, insomnia, constipation, and anxiety — a symptom cluster consistent with magnesium insufficiency — receives 50 mg of magnesium oxide from a standard multivitamin. Magnesium oxide has approximately 4% bioavailability. The patient is receiving a dose insufficient to replicate the clinical outcomes documented by DiNicolantonio et al. (Open Heart, 2018), which required correcting erythrocyte magnesium into the therapeutic range using glycinate or malate forms at 300-600 mg elemental doses. The multivitamin approach provides sub-therapeutic doses of multiple minerals in forms with poor absorptive characteristics, creating the illusion of adequacy while leaving documented deficiencies unresolved. Prasad (Mol Med, 2008) demonstrated that restoring zinc status in deficient subjects required 25-45 mg of elemental zinc daily in bioavailable form — a dose four to nine times what most multivitamins supply. Therapeutic mineral supplementation requires deficiency confirmation, form selection for bioavailability, dose calibration to target range, and serial testing to confirm repletion.
Research & Evidence
Widespread mineral deficiencies in modern populations reflect a convergence of soil depletion, food processing losses, and dietary pattern shifts away from mineral-dense whole foods. Magnesium is arguably the most clinically consequential: DiNicolantonio JJ et al. (Open Heart, 2018) established that subclinical magnesium deficiency — present in an estimated 45% of the US population and confirmed only by erythrocyte or ionized testing rather than standard serum levels — drives NF-kB-mediated vascular inflammation, impairs endothelial nitric oxide synthase activity, promotes arterial calcification, and constitutes a primary driver of cardiovascular disease independent of conventional risk factors. Magnesium functions as a cofactor for over 300 enzymatic reactions including DNA polymerase, ATP synthase, and all kinase-dependent phosphorylation reactions. Prasad AS (Mol Med, 2008;14(5-6):353-357) documented that zinc deficiency impairs thymic function, reduces natural killer cell cytotoxicity, and suppresses IL-2 and interferon-gamma production — consequences directly measurable in patient immune surveillance capacity. Selenium is the rate-limiting cofactor for glutathione peroxidase isoforms 1 and 4, the primary enzymatic defense against lipid hydroperoxide accumulation. Iodine deficiency beyond thyroid function extends to breast epithelial and ovarian tissue, where iodine serves as a direct antioxidant and apoptosis regulator in fibrocystic pathology.
Your First Appointment
Describe symptoms that may relate to specific mineral deficiencies: muscle cramps and twitching (magnesium), frequent illness and slow wound healing (zinc), fatigue with cold sensitivity (iron), hair loss and brittle nails (selenium, iron), and restless leg syndrome (iron, magnesium).',
Why Dr. Hendry for Mineral Supplementation
Dr. Hendry's functional medicine testing approach identifies mineral deficiencies using optimal reference ranges — catching deficiencies that conventional normal ranges miss. His prescribing uses forms with superior absorption (glycinate, malate, bisglycinate chelates) rather than cheap forms with poor bioavailability.