Metagenics® MyoCalm® Plus: A Pharmacist’s Guide

Dai Tran, PharmD, MBA, B.S.

CEO & Lead Pharmacist, Khang Pharmacy • CA/MN/TX Licensed Pharmacist

Clinical Insights Series • APhA Immunization Certified • 10+ Years Clinical Experience

The Clinical Question

Metagenics® MyoCalm® Plus is a six-ingredient formula combining two bioavailable minerals — calcium as calcium lactate and magnesium as magnesium citrate — with four botanical extracts: lemon balm, hops, passionflower, and valerian. It is designed to support neuromuscular relaxation and to ease tension associated with stress.

This article reviews what human clinical research supports for each ingredient at the relevant doses and extract types. Ingredient-level evidence does not establish the efficacy or safety of this finished six-ingredient combination product.

Supplement Facts (Per 3-Tablet Serving)

Serving size: 3 tablets | Servings per container: 20 | Suggested use: Take 3 tablets once daily or as directed by your healthcare practitioner.

** Daily Value not established. Other ingredients: Microcrystalline cellulose, croscarmellose sodium, cellulose, stearic acid (vegetable), silica, coating (hypromellose, medium-chain triglycerides, hydroxypropylcellulose). Non-GMO. Gluten-free. Vegetarian.

What the Evidence Does — and Does Not — Establish

• Established physiological roles: Magnesium has well-characterized roles in muscle physiology and nerve function. Calcium is the primary trigger for muscle contraction; adequate magnesium supports the relaxation phase.
• Preliminary: The four botanical ingredients each have limited human clinical evidence for anxiety, sleep, or relaxation outcomes. Effect sizes in available trials are generally modest, studies are small, and most have methodological limitations.
• Not established: That this six-ingredient combination produces additive or superior benefit for neuromuscular relaxation compared to individual components or placebo. No human RCT exists for this specific finished formula.
• Important: The botanical doses in this formula (especially valerian at 30 mg extract) are lower than doses studied in most human clinical trials. Efficacy at these specific doses and extract ratios cannot be assumed from the cited trial evidence.

Why Magnesium and Muscle Relaxation Are Physiologically Linked

Muscle contraction is initiated by calcium binding to troponin, triggering the actin-myosin cross-bridge cycle. Relaxation requires calcium to be pumped out of the myocyte — a process that is ATP-dependent and magnesium-regulated. Magnesium also modulates NMDA receptor activity and GABAergic tone, which are relevant to nervous system excitability and the perception of tension. Suboptimal magnesium intake is common in the U.S. adult population based on dietary surveys; whether supplementation in individuals with adequate status produces meaningful clinical benefit is less established.

Ingredient-by-Ingredient Evidence Review

Presented in order of current human clinical evidence strength.

1. Magnesium (as magnesium citrate) — 150 mg [Strongest physiological rationale; modest direct RCT evidence for sleep/relaxation]

Magnesium citrate is a well-absorbed organic magnesium salt. The 150 mg elemental magnesium per serving represents 36% of the Daily Value.

• A randomized, double-blind, placebo-controlled clinical trial (Abbasi et al., PMID: 23853635; n=46 older adults with primary insomnia) evaluated magnesium 500 mg/day versus placebo for 8 weeks. Magnesium improved several subjective sleep measures versus placebo, including ISI score, sleep efficiency, and sleep-onset latency. The study was small and population-specific (older adults); the dose studied (500 mg/day) is substantially higher than the 150 mg elemental magnesium in this formula.
• A more recent randomized, placebo-controlled trial (Schuster et al., PMID: 40918053; n=155 adults ages 18–65) evaluating magnesium bisglycinate 250 mg elemental/day for 4 weeks found a statistically significant but small reduction in ISI scores versus placebo (Cohen’s d=0.2). The magnesium form (bisglycinate) and dose (250 mg) differ from this formula (citrate, 150 mg); direct equivalence should not be assumed.
• Magnesium’s role in muscle physiology is mechanistically well-established; direct RCT evidence for muscle-tension reduction from supplementation in adults without deficiency is more limited.

2. Calcium (as calcium lactate) — 75 mg [Established physiological role; limited direct supplementation evidence for relaxation]

Calcium lactate is a bioavailable organic calcium salt. The 75 mg per serving represents 6% of the Daily Value — a modest supplemental dose.

• Calcium plays a direct role in muscle contraction through calcium-troponin binding and excitation-contraction coupling. However, dietary calcium supplementation in adults without deficiency has not been established to reduce muscle tension or improve relaxation outcomes in controlled clinical trials at this dose.
• The inclusion of calcium alongside magnesium in this formula reflects the physiological interdependence of these minerals in muscle function; it is not supported by a direct RCT demonstrating relaxation benefit from calcium supplementation at 75 mg.

3. Valerian (Valeriana officinalis) Root Extract — 30 mg [Most studied botanical for sleep; dose in this formula is substantially lower than trials]

Valerian root is one of the most extensively studied botanicals for sleep and relaxation. Multiple proposed mechanisms have been investigated, including modulation of GABAergic activity and adenosine receptor interactions.

• A meta-analysis (Bent et al., PMID: 16580573; 16 eligible studies) found that valerian may improve subjective sleep quality without producing side effects; however, the authors concluded that evidence was insufficient to confirm efficacy due to methodological limitations across trials. Most trials used valerian doses of 300–600 mg root extract per dose — substantially higher than the 30 mg concentrated extract in this formula.
• A separate systematic review (Fernandez-San-Martin et al., PMID: 20347389; 6 trials) of valerian for insomnia found inconclusive results, with only two of six trials showing statistically significant improvement in sleep quality versus placebo.
• Dose note: Most human trials used 300–600 mg of valerian root extract per dose. The 30 mg concentrated extract (Valeriana officinalis root extract, ratio not specified) in this formula may not deliver equivalent valerenic acid content to studied preparations. Clinical benefit at this dose cannot be assumed from the existing trial literature.

4. Lemon Balm (Melissa officinalis) Leaf 4:1 Extract — 150 mg [Limited human evidence; most cited study is open-label]

Lemon balm has been used traditionally for nervous tension and mild anxiety. The proposed mechanism involves rosmarinic acid inhibiting GABA transaminase, which would increase available GABA; this mechanism is primarily preclinical.

• Cases et al. (PMID: 22207903) conducted a prospective open-label pilot study in 20 volunteers with mild-to-moderate anxiety and sleep disturbances. Participants received standardized Melissa officinalis extract for 15 days, with self-reported improvements in anxiety and insomnia measures. The study lacked a placebo control and was small and short-duration; it does not establish efficacy for muscle tension or relaxation. This study is sometimes incorrectly characterized as a double-blind RCT; it was open-label and uncontrolled.
• A 4:1 extract at 150 mg provides approximately 600 mg equivalent of dried leaf. Generally well-tolerated in short-term use.

5. Passionflower (Passiflora incarnata) Flower 5.5:1 Extract — 60 mg [Very limited human evidence; tea preparation vs. extract]

Passionflower has been studied for anxiety and sleep. Proposed mechanisms involve GABA receptor modulation, but the specific binding and clinical relevance to oral supplementation remain areas of active research.

• A randomized, double-blind, placebo-controlled repeated-measures trial (Ngan & Conduit, PMID: 21294203; n=41 healthy adults) found passionflower tea improved subjective sleep quality over one week versus placebo. The study used a tea preparation; dose equivalence to standardized concentrated extract is uncertain. This does not establish passionflower extract as a treatment for muscle tension or relaxation.
• A 5.5:1 extract at 60 mg is approximately equivalent to 330 mg of dried aerial parts. Most passionflower human trials have used preparations that are not directly comparable to this extract ratio. Human evidence specific to muscle-tension outcomes is not available.
• Patients taking sedative medications should discuss use with their pharmacist due to possible additive CNS effects.

6. Hops (Humulus lupulus) Cone 7.5:1 Extract — 60 mg [Weakest direct human evidence for relaxation as monotherapy]

Hops strobiles have been used traditionally for sedation and nervous tension. The primary proposed active compound is 2-methyl-3-buten-2-ol, formed from the degradation of alpha-acids. Most human evidence evaluates hops in combination with valerian, not as monotherapy.

• A double-blind, randomized, placebo-controlled crossover study (Franco et al., PMID: 22609233; n=17 nurses with rotating shift work) found a combination of valerian and hops improved sleep quality significantly versus placebo. The study evaluated a fixed-dose combination; the contribution of hops specifically cannot be isolated from this trial. Most trials combining valerian and hops use hops doses of 120–240 mg of dried extract — higher than the 60 mg concentrated extract in this formula.
• Direct human evidence for hops as a monotherapy for muscle tension or nervous system relaxation at this dose is not established.

Proposed Mechanisms

The formula proposes to address neuromuscular relaxation through two primary pathways:

• Mineral support for muscle physiology: Magnesium (calcium antagonist in myocyte relaxation, ATP cofactor, NMDA modulation) + Calcium (contraction-relaxation cycle support)
• GABAergic nervous system support: Lemon Balm (proposed GABA transaminase inhibition, preclinical) + Passionflower (proposed GABA receptor modulation, mechanism not established clinically) + Valerian (proposed GABAergic and adenosine modulation) + Hops (sedative properties, mechanism not fully established in humans)

These mechanisms are physiologically plausible based on the available evidence. Whether the six ingredients operate additively or synergistically in this finished formula, at these specific doses and extract concentrations, has not been established in a human clinical trial.

Safety & Medication Considerations

• Sedative medications and CNS depressants: The botanical blend (valerian, hops, passionflower, lemon balm) may produce additive sedative effects when combined with benzodiazepines, prescription sleep aids, opioids, or other CNS depressants. Discuss with your pharmacist before combining.
• Driving and machinery: This formula may cause drowsiness. Use caution when driving or operating machinery, especially when first starting use.
• Magnesium: 150 mg elemental magnesium is generally well-tolerated. Use caution in patients with renal impairment; consult pharmacist or prescriber.
• Pregnancy and lactation: If pregnant, nursing, or taking medication, consult your healthcare practitioner before use. Valerian, hops, and passionflower have insufficient safety data for use during pregnancy.
• Thyroid medications: No specific interaction data for this formula; however, discuss any new supplement with your pharmacist if you take thyroid medications.

Who May Consider Metagenics® MyoCalm® Plus?

• Adults with stress-related muscle tension who are interested in a non-sedative-medication approach and want to review the evidence with a pharmacist
• Adults who have difficulty winding down at night due to physical or mental tension and are not taking sedative medications or other CNS depressants without pharmacist review
• Adults seeking a magnesium supplement with additional botanical support for relaxation
• Individuals who prefer a practitioner-grade, vegetarian, gluten-free formulation
• Not appropriate without pharmacist review for patients on benzodiazepines, prescription sleep medications, or other CNS depressants
• Not appropriate for use during pregnancy or lactation without healthcare provider guidance

Selected Key Studies

1. HUMAN RCT Abbasi B, 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.
   Randomized, double-blind, placebo-controlled trial (n=46 older adults with primary insomnia); magnesium 500 mg/day for 8 weeks. Significant improvements in ISI, sleep efficiency, sleep time, sleep onset latency, early morning awakening, and serum cortisol versus placebo. Population-specific (older adults); dose studied (500 mg/day) is substantially higher than the 150 mg in this formula.
2. SYSTEMATIC REVIEW / META-ANALYSIS Bent S, Padula A, Moore D, Patterson M, Mehling W. Valerian for sleep: a systematic review and meta-analysis. Am J Med. 2006;119(12):1005–1012. PMID: 16580573.
   Systematic review and meta-analysis (16 eligible studies) of valerian for sleep. Valerian may improve subjective sleep quality without producing side effects, but evidence was insufficient to confirm efficacy due to methodological limitations. Most trials used 300–600 mg root extract per dose — substantially higher than the 30 mg extract in this formula.
3. HUMAN RCT Franco L, et al. The sedative effects of hops (Humulus lupulus), a component of beer, on the activity/rest rhythm. Acta Physiol Hung. 2012;99(2):133–139. PMID: 22609233.
   Double-blind, randomized, placebo-controlled crossover study (n=17 nurses with rotating shift work); valerian + hops combination improved sleep quality significantly versus placebo. The hops contribution cannot be isolated as monotherapy from this combination trial. Doses studied are higher than in this formula.
4. HUMAN RCT Ngan A, Conduit R. A double-blind, placebo-controlled investigation of the effects of Passiflora incarnata (passionflower) herbal tea on subjective sleep quality. Phytother Res. 2011;25(8):1153–1159. PMID: 21294203.
   Randomized, double-blind, placebo-controlled repeated-measures trial (n=41 healthy adults); passionflower tea improved subjective sleep quality over one week versus placebo. Tea preparation; dose equivalence to concentrated extract is uncertain. Does not establish passionflower extract as a treatment for muscle tension or relaxation.
5. HUMAN STUDY Cases J, et al. Pilot trial of Melissa officinalis L. leaf extract in the treatment of volunteers suffering from mild-to-moderate anxiety disorders and sleep disturbances. Med J Nutrition Metab. 2011. PMID: 22207903.
   Prospective open-label pilot study (n=20); standardized Melissa officinalis extract for 15 days, with self-reported improvements in anxiety and insomnia measures. Lacked a placebo control; small and short-duration. Does not establish efficacy for muscle tension or relaxation. This is open-label and uncontrolled — not a double-blind RCT as it is sometimes characterized.

Pharmacist’s Perspective

As a PharmD, I discuss Metagenics® MyoCalm® Plus with patients looking for a non-medication approach to stress-related muscle tension. The formula’s magnesium component has the strongest physiological rationale and the most relevant human evidence, though the 150 mg dose is lower than what most sleep-specific trials have used. The four botanicals each have traditional use and limited-to-modest human data, but the doses — particularly valerian at 30 mg extract — are substantially lower than those studied in most human trials. I present this as a reasonable evidence-informed option for mild tension and winding down, not as a clinically proven muscle relaxant or sleep treatment. The most important pre-recommendation step is a full medication review, because the combination of four sedative botanicals can add to the effects of prescription CNS depressants. Free PharmD consultation: (408) 622-8068.

Frequently Asked Questions

Q: Can I take MyoCalm® Plus with my sleep medication?
A: Not without pharmacist or prescriber review. The four botanical ingredients in this formula (valerian, hops, passionflower, lemon balm) may produce additive sedative effects with prescription sleep aids, benzodiazepines, or other CNS depressants. Please contact our pharmacy before combining.

Q: Will this formula make me drowsy?
A: It may. The product label specifically advises caution when driving or operating machinery. Start with the evening dose as directed and assess your individual response before taking it at other times of day.

Q: Is this the same as a muscle relaxant medication?
A: No. This is a dietary supplement, not a prescription or OTC muscle relaxant. The mechanisms are distinct — the formula supports magnesium-mediated muscle physiology and GABAergic relaxation pathways through botanical extracts, rather than acting as a direct skeletal muscle relaxant like cyclobenzaprine or methocarbamol.

Q: Can I take this during pregnancy?
A: No. Several botanical ingredients in this formula, including valerian and hops, have insufficient safety data for use in pregnancy or lactation. Do not use without explicit discussion with your OB or healthcare provider.

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Reviewed by: Dai Tran, PharmD, MBA, B.S.  View full bio →

CEO & Lead Pharmacist, Khang Pharmacy • CA/MN/TX Licensed Pharmacist

Clinical Insights Series • APhA Immunization Certified • 10+ Years Clinical Experience

Khang Pharmacy | 2451 S King Rd., Ste A1, San Jose, CA 95122 | (408) 622-8068 | www.khangpharmacy.com