Fully Chelated High-Absorption Magnesium Bisglycinate with BioPerine® for Restful Sleep, Muscular Relaxation, and Neurological Balance
✓ 350 mg Pure Elemental Magnesium✓ 100% Fully Chelated Bisglycinate✓ Enhanced with BioPerine® (5 mg)✓ Gentle on Sensitive Stomachs (Non-Laxative)✓ 100% Vegan & Non-GMO Project Verified✓ 40-Day Supply (160 VegCaps)
KAL Magnesium Glycinate 350mg (Item SKU: 39022, UPC: 021245390220) delivers a clinical daily therapeutic dose of 350 milligrams of pure elemental magnesium chelated with the inhibitory amino acid glycine. Formulated specifically to overcome the digestive distress and poor intestinal transit typical of conventional magnesium oxide and citrate supplements, KAL binds elemental magnesium to two molecules of glycine (forming pure magnesium bisglycinate). This covalent bond enables the mineral to navigate the harsh acidic environment of the stomach intact, utilizing dipeptide transport pathways in the small intestine rather than competing for unstable ion-channel receptors.
To optimize GI absorption kinetics, KAL enhances this vegan formulation with BioPerine® (standardized black pepper fruit extract containing 95% piperine), clinically documented to stimulate thermogenic activity in digestive enterocytes. Whether you suffer from nocturnal leg cramps, occasional sleep latency, muscular tension, or subclinical dietary magnesium deficiency, this lab-verified formula delivers therapeutic purity backed by KAL's 90+ year manufacturing legacy (since 1932).
The Science of Absorption: Why Chelated Bisglycinate Outperforms Inorganic Salts
Standard mineral supplements (such as magnesium oxide, sulfate, and carbonate) possess an inorganic ionic structure that dissociates rapidly in hydrochloric stomach acid. Once ionized, unabsorbed free magnesium ions draw large volumes of water into the colon via osmotic pressure, frequently triggering gastrointestinal cramping, laxative side effects, and rapid fecal evacuation before systemic cellular uptake can occur.
The Dipeptide Intestinal Transport Pathway (PEPT1)
In contrast, KAL Magnesium Glycinate utilizes true organic chelation where one magnesium cation is securely bonded to two L-glycine molecules. This stable heterocyclic ring structure creates an electrically neutral compound that completely changes the mineral's biological fate:
✓Intact Gastric Transit: The chelate remains non-ionized across variable gastrointestinal pH gradients, preventing the osmotic water-pulling effect that causes loose stools and diarrhea.
✓PEPT1 Transporter Uptake: Instead of relying on saturable ion channels (TRPM6/TRPM7) or passive paracellular diffusion, magnesium bisglycinate is actively absorbed through peptide carrier proteins (PEPT1) in the jejunum.
✓No Mineral Competition: Glycine shielding prevents magnesium from binding to dietary phytates or competing with dietary calcium and iron for transport receptors.
Clinical Bioavailability Benchmark: In human pharmacokinetic trials published in the Journal of Parenteral and Enteral Nutrition, chelated magnesium bisglycinate demonstrated superior bioavailability and red blood cell (RBC) retention compared to magnesium oxide, displaying consistent gastrointestinal absorption even in individuals with malabsorptive bowel conditions.
Clinical Reference Citations:
Schuette SA, Lashner BA, Janghorbani M. Bioavailability of magnesium diglycinate vs magnesium oxide in patients with ileal resection. JPEN J Parenter Enteral Nutr. 1994;18(5):430-435. [PMID: 7815675]
Siebrecht S. Magnesium Bisglycinate as safe form for mineral supplementation in human nutrition. OM & Ernährung. 2013;144:1-16.
Evidence-Based Clinical Health Benefits
Magnesium serves as an essential obligate cofactor in over 300 biochemical and enzymatic reactions throughout the human body, governing cellular ATP synthesis, genomic integrity, protein translation, and systemic electrolyte balance.
1. Deep Sleep Architecture & GABA Neurotransmission
Magnesium bisglycinate functions as a natural agonist for gamma-aminobutyric acid (GABAA) receptors within the central nervous system. GABA is the primary inhibitory neurotransmitter responsible for dampening cortical excitability, slowing racing thoughts, and preparing the brain for slow-wave sleep. Concurrently, free L-glycine crosses the blood-brain barrier where it acts on NMDA receptors in the suprachiasmatic nucleus, lowering core body temperature and facilitating deeper REM and delta-wave sleep cycles without morning grogginess.
2. Neuromuscular Relaxation & Muscle Spasm Relief
Within the sarcoplasmic reticulum of skeletal muscle cells, calcium triggers contraction while magnesium facilitates actin-myosin dissociation and cellular relaxation. When cellular magnesium stores drop, unchecked calcium influx causes sustained hypertonicity, nocturnal leg cramps, involuntary muscle twitches, and post-exercise stiffness. KAL Magnesium Glycinate restores physiological electrolyte balance, providing rapid relief for active musculature.
Sustained psychological stress stimulates excessive urinary magnesium excretion, initiating a damaging feedback loop of elevated cortisol, autonomic hyper-reactivity, and tension. Systematic reviews establish that therapeutic magnesium bisglycinate attenuates the sensitivity of the hypothalamic-pituitary-adrenal (HPA) axis, modulating adrenaline release and promoting neurochemical resilience.
4. Bone Mineral Matrix & Active Vitamin D Synthesis
Approximately 60% of total bodily magnesium is stored directly within the skeleton. Magnesium is required by hepatic and renal 25-hydroxylase enzymes to convert inactive Vitamin D into its biologically active hormone form (1,25-dihydroxycholecalciferol). Without sufficient magnesium, supplemental calcium cannot properly integrate into the bone hydroxyapatite matrix, risking abnormal arterial calcification.
Clinical Reference Citations:
Abbasi B, Kimiagar M, Sadeghniiat K, et al. The effect of magnesium supplementation on primary insomnia in elderly: A double-blind placebo-controlled clinical trial. J Res Med Sci. 2012;17(12):1161-1169. [PMID: 23853635]
Boyle NB, Lawton C, Dye L. The Effects of Magnesium Supplementation on Subjective Anxiety and Stress—A Systematic Review. Nutrients. 2017;9(5):429. [PMID: 28445426]
Kawai N, Sakai N, Okuro M, et al. The sleep-promoting and hypothermic effects of glycine are mediated by NMDA receptors in the suprachiasmatic nucleus. Neuropsychopharmacology. 2015;40(6):1405-1416. [PMID: 25533934]
Complete Supplement Facts & Full Ingredient Listing
Every lot of KAL Magnesium Glycinate 350mg is third-party tested and verified for pure elemental mineral potency, total heavy metal clearance, and rapid capsule dissolution. Below is the full nutritional profile for the 160 VegCap format (SKU: 39022):
Maximizing the clinical outcomes of magnesium supplementation requires strategic intake timing matched to your specific metabolic and neurological goals.
Evidence-Based Usage Protocols
✓Standard Daily Maintenance: Take 4 VegCaps daily with an 8 oz glass of pure water or alongside a balanced meal, supplying 350 mg of elemental magnesium (83% of the NIH adult Recommended Dietary Allowance).
✓For Insomnia & Nocturnal Leg Cramps: Take the entire serving of 4 VegCaps approximately 45 to 60 minutes before bedtime. The dual action of glycine and GABA receptor stimulation fosters rapid sleep latency and quiets nocturnal muscular spasms.
✓For Day-Long Stress & Muscle Recovery: Divide the serving: take 2 VegCaps with breakfast and 2 VegCaps with dinner to maintain stable intracellular serum concentrations around the clock.
✓Nutrient Synergies: Take alongside active Vitamin B6 (pyridoxal-5-phosphate), which acts as a cellular transport chaperone for magnesium, and Vitamin D3/K2 for optimal calcium distribution.
Enteric Tolerability Tip: BioPerine® utilizes natural piperine to stimulate local mesenteric microcirculation. While highly beneficial for absorption, individuals with active gastric ulcers or acid reflux should consume their VegCaps alongside food rather than on an empty stomach.
Safety Profile, Contraindications & Medical Interactions
Magnesium bisglycinate possesses one of the highest safety indices among dietary minerals. However, rigorous medical guidelines dictate clear disclosure of patient contraindications and drug interactions.
Absolute Clinical Contraindications:
Severe Renal Impairment (CKD Stages 4–5): Individuals with impaired kidney clearance must not supplement with magnesium without direct nephrological oversight. Inability to eliminate excess mineral can result in life-threatening hypermagnesemia.
Severe Cardiac Bradycardia & AV Heart Block: Divalent magnesium exhibits intrinsic calcium-channel-blocking properties and should be used under physician supervision in patients with second- or third-degree atrioventricular block.
Documented Pharmaceutical Interactions:
Medication Category
Prescription Drugs
Mechanism & Clinical Management
Antibiotics (Tetracyclines & Quinolones)
Doxycycline, Ciprofloxacin, Levofloxacin
Forms insoluble metal chelates in the digestive tract, preventing antibiotic absorption. Protocol: Space magnesium at least 2 hours before or 4 to 6 hours after antibiotics.
Bisphosphonates (Osteoporosis)
Alendronate (Fosamax), Risedronate
Concurrent intake drastically reduces bisphosphonate bioavailability. Protocol: Administer at least 2 full hours apart.
Thyroid Hormone Replacement
Levothyroxine (Synthroid)
Magnesium interferes with levothyroxine GI uptake. Protocol: Separate ingestion by at least 4 hours.
Loop Diuretics & Long-Term PPIs
Furosemide, Omeprazole, Esomeprazole
These pharmaceuticals induce chronic renal or GI magnesium wasting. Co-supplementation is beneficial but serum levels should be clinically monitored.
California Proposition 65 Notice: Compliant with California Health & Safety Code Section 25249.6 and FDA cGMP purity thresholds. Natural plant and mineral-derived raw materials undergo validated ICP-MS testing to confirm heavy metal clearance below USP safety limits.
Magnesium Form Comparison: Why Chelated Bisglycinate Excels
Different magnesium chemical forms have vastly different absorption rates, digestive tolerances, and physiological tissue affinities. Here is how KAL's 350 mg bisglycinate compares:
Magnesium Form
Bioavailability
Digestive Tolerance
Optimal Application
KAL Magnesium Bisglycinate (350mg)
Superior (PEPT1 peptide uptake)
Gentlest on gut (Zero laxative effect)
Deep sleep, nighttime leg cramps, stress, neuromuscular tension
When shopping online for health supplements, verifiable testing protocols and certified manufacturing standards are vital for patient safety. KAL manufactures according to stringent quality systems that surpass FDA 21 CFR Part 111 cGMP regulations:
✓State-of-the-Art Utah Facility: Manufactured in an FDA-registered, cGMP-certified laboratory in Ogden, Utah, backed by over 90 years of nutritional science experience.
✓ICP-MS Heavy Metal Testing: Every batch is screened via Inductively Coupled Plasma Mass Spectrometry to verify lead, arsenic, cadmium, and mercury levels remain well below strict USP limits (<3 ppm).
✓Microbial PCR Pathogen Screening: Molecular Polymerase Chain Reaction assays confirm total absence of E. coli, Salmonella, Staphylococcus, and mold/yeast contaminants.
✓USP Gastric Disintegration Standards: Capsules are tested in simulated stomach acid to guarantee full capsule disintegration and nutrient release within 30 minutes.
✓VitaNet® Direct Guarantee: Established in 1995, VitaNet® maintains an A+ BBB rating, offering an industry-exclusive 12-month money-back guarantee with prepaid return shipping.
Frequently Asked Questions (FAQ)
1. Does KAL Magnesium Glycinate 350mg cause diarrhea or an upset stomach?
No. Unlike magnesium oxide or citrate which draw water into the intestines through osmotic pressure, KAL Magnesium Glycinate is fully chelated to two glycine amino acids. This prevents free magnesium ions from causing loose bowels, making it non-laxative and gentle on sensitive digestive tracts.
2. What is the difference between elemental magnesium and total magnesium compound weight?
"Elemental magnesium" represents the true quantity of active mineral available for biological uptake, whereas compound weight includes the attached glycine molecules. KAL transparently provides 350 mg of pure elemental magnesium per 4-VegCap serving, meeting 83% of the adult Daily Value.
3. Why is BioPerine® added to this magnesium supplement?
BioPerine® is a clinically researched black pepper extract standardized to 95% piperine. Peer-reviewed research shows piperine stimulates intestinal microcirculation and optimizes the absorption kinetics of minerals across the mucosal lining.
4. What is the best time of day to take KAL Magnesium Glycinate?
For sleep latency, anxiety relief, or nocturnal leg cramps, take the full 4 VegCaps 45 to 60 minutes before bed. For muscle recovery and all-day stress balance, divide the dose: take 2 VegCaps with breakfast and 2 VegCaps with dinner.
5. Can I take this magnesium if I am on prescription medications?
Magnesium can bind with quinolone and tetracycline antibiotics, bisphosphonates, and thyroid medications (such as levothyroxine), reducing their efficacy. Space magnesium ingestion by at least 2 to 4 hours from prescription drugs and consult your physician before starting.
6. Are the VegCaps 100% vegetarian and vegan friendly?
Yes. The capsules are made from 100% plant-derived vegetable cellulose (hypromellose). The formula contains zero animal gelatin, dairy, gluten, soy, nuts, or GMO ingredients.
7. How long will one bottle of 160 VegCaps last?
At the full therapeutic serving of 4 VegCaps daily, one 160-count bottle provides a 40-day supply of 350 mg elemental magnesium.
