CuratedFit
Last reviewed:
7/8/26
Last updated:
10/3/26
Source Naturals
Magnesium Bis-Glycinate
A single-form magnesium chelate with a clearly disclosed 200 mg dose per serving, avoiding the undisclosed multi-form ratio issue seen in several other magnesium and probiotic products reviewed in this catalogue.
Daily Foundations
120 Tablets
2 tablets
CURATEDFIT SUMMARY
Passes because this is a single magnesium form, bis-glycinate, at a clearly disclosed dose, rather than a blend of multiple magnesium forms under one combined total. Calcium is also present, again as a single disclosed form (dibasic calcium phosphate), which also functions as a bulking agent in the tablet. Both minerals are flagged rather than failed on natural origin per the CuratedFit Standard's mineral precedent. One inconsistency is worth noting before publishing, retailer sources do not agree on the exact calcium amount.
WHAT IT IS
A vegetarian tablet delivering 200 mg of elemental magnesium per two-tablet serving, chelated to the amino acid glycine, a form generally associated with efficient intestinal absorption. Calcium is also present via dibasic calcium phosphate, which serves a dual role here, contributing declared calcium content while also functioning as a tableting excipient. The manufacturer states the product contains no sugar, starch, salt, preservatives, or artificial color, flavor, or fragrance.
WHO IT IS FOR
Someone who wants a single-form magnesium supplement with a clearly disclosed dose, rather than a multi-form blend where the internal ratio between forms isn't broken out.
INGREDIENT BREAKDOWN
Magnesium (as magnesium bis-glycinate)
2 capsules 200 mg, DV: 50%
A single, clearly quantified magnesium form. Unlike the multi-form magnesium products reviewed elsewhere in this catalogue, there is no blend of multiple magnesium salts to disclose, the entire 200 mg comes from one named form. Under the CuratedFit Standard's mineral precedent, this is flagged rather than failed on natural origin, since it is an industrially manufactured mineral compound rather than a biosynthesized active.
Calcium (as dibasic calcium phosphate)
2 capsules 95 mg, DV: 7%
Present both as a declared active with its own percentage daily value and as a functional tableting ingredient. This dual role is common in mineral tablets and is not itself a transparency issue, since the amount is disclosed on the nutritional panel rather than buried only in the other ingredients list.
Sodium
2 capsules 10 mg, DV: <1%
Naturally present in the mineral compounds used
Other ingredients
Microcrystalline Cellulose, Dibasic Calcium Phosphate, Stearic Acid, Modified Cellulose Gum, Hydroxypropyl Cellulose, Magnesium Stearate, Silica
CERTIFICATIONS
Informed Sport
Not Confirmed
Banned substance tested
Not Confirmed
GMP Certified
Not Confirmed
Heavy metals tested
Not Confirmed
BRCGS
Not Confirmed
FSSC 22000
Not Confirmed
CURATEDFIT STANDARD CHECK
Warning
As Natural As Possible
Both magnesium bis-glycinate and dibasic calcium phosphate are industrially manufactured mineral compounds. Flagged per the CuratedFit Standard's mineral active precedent, not failed.
Warning
Contains What It Claims
Magnesium content (200 mg) is consistent across sources. Calcium content is not, one retailer states 95 mg, another states 140 mg. CuratedFit has not seen independent lab verification of either figure.
Pass
Every Ingredient Earns Its Place
Standard functional excipients only. Manufacturer states no sugar, starch, preservatives, or artificial color, flavor, or fragrance
Pass
No Insect-Derived Ingredients
No animal or insect derived ingredients present
Pass
No Proprietary Blends
Each mineral is a single named form with its own disclosed quantity. No undisclosed ratio between multiple forms of either active
Pass
Allergen Declaration
Manufacturer explicitly states the product contains no yeast, dairy, egg, gluten, corn, soy, or wheat
Pass
Sugar Content Declared
Manufacturer explicitly states no sugar is present
Pass
Artificial Sweeteners and Flavorings
Manufacturer explicitly states no artificial color, flavor, or fragrance is present
Info
Heavy Metals and Contaminants
Not addressed via any of the six specific certifications checked.
Pass
Banned Substance Risk Declared
Mineral compounds only, no stimulant or hormonal precursor compounds.
Info
Country of Manufacture Noted
Not confirmed in the sources reviewed
TRANSPARENCY NOTE
This product avoids the specific issue that has driven several fail verdicts elsewhere in this catalogue. Both magnesium and calcium are disclosed as single named forms with their own individual quantities, rather than being combined with other forms of the same mineral under one undifferentiated total. That distinction matters. A single, clearly quantified form can be evaluated directly against its stated dose, while a combined total across multiple forms cannot rule out one form dominating the mix.
One genuine inconsistency needs to be flagged before this goes any further. Retailer sources do not agree on the calcium content. Most give 95 mg at 7% DV, but at least one independent retailer states 140 mg at 14% DV. This kind of discrepancy could reflect a product reformulation between different production runs, a labelling error at one retailer, or simply outdated information on one page. CuratedFit was not able to resolve this from publicly available sources, so it's presented here as an open question rather than a resolved fact. If this product moves toward publication, confirming the current calcium figure against the physical label or the manufacturer directly would be worthwhile.
Both magnesium and calcium are flagged, not failed, on natural origin, consistent with how other mineral actives are treated throughout the catalogue.
FREQUENTLY ASKED QUESTIONS
Why is this flagged on natural origin if magnesium and calcium are natural minerals?
Because the specific compounds used, magnesium bis-glycinate and dibasic calcium phosphate, are industrially manufactured rather than biosynthesized. This is treated as a flag rather than a fail, consistent with how other mineral products are evaluated under the CuratedFit Standard.
Why does the calcium amount differ between sources?
CuratedFit found two different figures across the retailers checked, 95 mg on most, and 140 mg on one. This wasn't resolved from publicly available information and should be verified against the current physical label before publication.
Does this contain a proprietary blend?
No. Each mineral is a single named form with its own individually disclosed quantity.
Why does calcium appear in both the active nutrients and the other ingredients?
Dibasic calcium phosphate serves a dual function here, contributing measurable calcium content while also acting as a tableting excipient. Both roles are disclosed rather than hidden
Is this suitable for someone avoiding dairy or gluten?
Yes, based on the manufacturer's explicit free-from claims for dairy, gluten, yeast, egg, corn, soy, and wheat.
Has this been tested for heavy metals or contaminants?
Not confirmed via any of the six specific certifications this review checks.
Where is this product manufactured?
Not confirmed in the sources reviewed.
Sources:
Source Naturals official product page
10/3/26
Vitacost product listing
10/3/26
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