Chelation therapy negates phage killing of the targeted infections. Chelation should be avoided when using Induced Native Phage Therapy (Inducen®️). In vitro studies showed restoration of free Mg and/or Ca in the blood in the presence of EDTA, increased phage killing by an astounding 10,000-fold, while the depletion of these metals brought phage killing to zero. The addition of IV Mg and/or Ca when using any of the Inducen®️ formulas can potentially greatly enhance phage killing of the targeted infections.
In research published in Nature, by Li Ma, Sabrina I. Green, et. al., Metals Enhance the Killing of Bacteria by Bacteriophage in Human Blood, reports that chelation of metals, primarily Ca²⁺ and Mg²⁺. With depletion of the free Ca²⁺ and Mg²⁺ phage killing of bacteria is almost completely abolished. Conversely, Adding back Ca²⁺ or Mg²⁺ restores and enhances phage activity both in human blood assays and in the mouse infection model.
EDTA is a strong metal-chelating agent, which among other metals, scavenges free divalent cations (Ca²⁺, Mg²⁺). These metals are required for efficient phage activity, such as adsorption, DNA injection, or subsequent infection). Circulating free Ca²⁺ and Mg²⁺ are critical, previously underappreciated physiologic factors for phage antibacterial activity in blood.
Sodium citrate, sometimes used as a substitute for Heparin, is a classic metal chelator, especially of Ca²⁺, and to a lesser extent Mg²⁺and would be expected to prevent or strongly reduce (not enhance) phage killing of bacteria in vivo, based on the logic and findings of the paper.
What “free” Mg Means: In blood/plasma, roughly 55–70 % of total magnesium exists as the free ionized form (Mg²⁺)—the biologically active pool that the paper showed is needed for efficient phage activity. The rest is bound to proteins (mainly albumin) or complexed with anions. Oral supplements ultimately contribute to this free pool after intestinal absorption and entry into the circulation.
Intravenous versus Oral Supplementation of Ca²⁺, Mg²⁺
The research demonstrated increasing Ca²⁺, Mg²⁺ in vitro 5 mMol/L in vitro. Achieving 5 mMol/L in human blood is not possible, nor should be attempted. What this research does reveal is that increasing the free Ca²⁺, Mg²⁺ singly or in combination should exponentially increase phage killing in in a person not going through chelation, and post-chelation restoration of these metals will restore phage killing.
Therapeutic IV doses of magnesium and calcium, such as used in a Myer’s Cocktail, raise serum levels, typically into the 1.5–3.5 mmol/L total Mg range, with the 3.5 mmol/L level only under careful monitoring. These levels are still well below the 5 mM free-metal concentrations that produced the dramatic 10,000-fold increased phage killing in vitro to counteract the effects of EDTA. Yet, 5 mM/L was the amount needed to overcome the in vitro effects of the EDTA, not the levels needed to enhance phage killing in vivo, with or without chelation. In theory, any increase in blood levels of these metals will enhance phage killing to their maximum potential.
Oral Supplementation:
Oral magnesium supplementation can increase free (ionized) divalent Mg²⁺ in the blood, but the effect is modest, gradual, and substantially weaker than IV delivery.
Normal serum ionized Mg is ~0.5–0.6 mmol/L. Oral supplements raise it by only a few hundredths of a mmol/L. In the paper, effective enhancement of phage killing required adding 1–5 mM free metals—concentrations far higher than what oral dosing achieves in blood. Oral Mg absorption is limited (often 20–50 %), and the kidneys rapidly excrete excess Mg, so serum free levels plateau and do not stay elevated for long.
An IV Myers’ Cocktail or direct metal salts (as used in the paper’s mouse model) deliver a much larger, faster pulse of free Mg²⁺ (and usually Ca²⁺) directly into the bloodstream. Oral dosing cannot match that peak free-ion concentration or speed.
Reality Check
Healthy human blood already contains roughly 0.5–0.6 mmol/L ionized (free) Mg²⁺. The paper’s data is only in vitro testing with chelating agents, which required 5 mmol/L of Mg²⁺ to overcome the negative effects of the chelation. indicate that this natural level in healthy human blood is insufficient for efficient phage activity when combined with chelation therapy. Because the authors never tested metal supplementation in non-anticoagulated blood, and because cation-independent factors also limit killing, it is not possible to state from the paper what free Mg concentration would be required to achieve phage killing enhancement under health in vivo blood without chelating agent conditions, although it is clear that phage killing of bacteria is nullified when the patient is deficient in Mg²⁺ and/or Ca²⁺. Any extrapolation of ideal levels of these would be speculative and outside the data presented. Essentially more is better than lower levels in human blood. Attempting to exceed 3 mMol/L in a patient would be exceedingly dangerous and unnecessary.
Induced Native Phage Therapy works the vast majority of the time without any supplementation of these metals. Increasing the metals is only presented as an adjunctive way to enhance the effectiveness of phage killing.
Additional Benefits of Ca/Zn Regarding Phages and Biofilms
A separate 2022 study (on an MRSA phage cocktail) found that adding low concentrations of Ca²⁺ + Zn²⁺ improved anti-biofilm activity and gave modest additional bacterial reductions (~0.8–2.6 log) in insect and mouse models. (Nanoparticle Zn is a component of the blend of metals/minerals in the Inducen®️ formulas.)
Reference: Li X, Chen Y, Wang S, Duan X, Zhang F, Guo A, Tao P, Chen H, Li X, Qian P.
Exploring the Benefits of Metal Ions in Phage Cocktail for the Treatment of Methicillin-Resistant Staphylococcus aureus (MRSA) Infection.
Infection and Drug Resistance. 2022;15:2689-2702.
doi: 10.2147/IDR.S362743
PMID: 35655790
PMCID: PMC9154003
Key findings from the paper:
- Phage cocktail + Ca²⁺/Zn²⁺ reduced viable bacteria in 24-h or 48-h biofilms by >0.81 log compared with cocktail alone.
- In a mouse systemic infection model, the metal-supplemented cocktail produced a 2.64-log greater reduction in bacterial load than the cocktail alone.
Other helpful peer-reviewed papers:
- Chhibber et al. (2014), Journal of Basic Microbiology
“Essential role of calcium in the infection process of broad-spectrum methicillin-resistant Staphylococcus aureus bacteriophage.”
Showed that 5 mM Ca²⁺ significantly increased adsorption rate and final phage titer for an MRSA phage. Supports the low-millimolar range as biologically relevant for many phages. - Li et al. (2022), Frontiers in Cellular and Infection Microbiology (PMC9154003)
“Exploring the Benefits of Metal Ions in Phage Cocktail for the Treatment of Methicillin-Resistant Staphylococcus aureus (MRSA) Infection.”
Added Ca²⁺/Zn²⁺ (including concentrations as low as 0.1 mM in some assays) to a phage cocktail. This produced additional bacterial reductions of ~0.8 log in biofilms and up to ~2.6 log in a mouse systemic infection model, plus improved survival in Galleria mellonella. Closest recent in vivo evidence that supplemental divalent cations can improve phage efficacy, although the magnitude is far smaller than the 10,000-fold effect in the 2018 blood assays. - Stassano & de Beaufort (1925) and later work by Delbrück (1940s–1950s) established that many phages require free divalent cations (typically Ca²⁺ or Mg²⁺ in the 0.01–10 mM range) for efficient adsorption or DNA injection.
- A 2017 synthesis (Christi, Elliman & Owens) reviewed dozens of phage-host systems and concluded that optimal divalent cation concentrations for adsorption generally fall between 0.01 and 10 mM, with averages around ~2.4 mM Ca²⁺ or ~5 mM Mg²⁺ for efficient infection under laboratory conditions.
