Dr. Berg Magnesium Glycinate with Vitamin D3 Review 2026: Review
Checks out. — Legitimate
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"Magnesium glycinate is gentle and well-absorbed"
Glycinate chelate causes less GI upset than magnesium oxide, a well-established difference in absorption research.
General magnesium bioavailability research (Examine.com) -
"B6 and zinc doses are safe, not megadosed"
At 2.125mg B6 and 10mg zinc, both are far below toxicity thresholds (B6 nerve damage risk starts around 100mg/day).
Examine.com Vitamin B6 safety profile -
"$18.99 for 90 capsules is a fair price"
Generic magnesium glycinate brands sell similar counts for $10-15, so this is a moderate, not extreme, markup for branded packaging.
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"120mg magnesium per capsule supports sleep and relaxation"
Studies on magnesium for sleep typically use 200-400mg elemental magnesium; this capsule has 120mg, so you may need 2+ capsules to match study doses.
Consumer advice
If you want magnesium for sleep or muscle relaxation, this product delivers a real, well-absorbed form at a reasonable dose. But compare price per capsule to generic magnesium glycinate brands at the pharmacy or Amazon first — many offer the same chelate form for less. The B6 dose (2.125mg, 125% DV) is well within safe limits, and zinc (10mg) and D3 (250 IU) are modest, not mega-doses. No major red flags here.
Claims vs Evidence
MODEST4 claims assessed. These grades assess the marketing claims, not the whole product. See each explanation for the evidence and its limits.
"promotes relaxation / targeted stress relief"
Partial
Magnesium may ease tension, especially if you're deficient; not guaranteed
Based on: Magnesium Glycinate
Source: General magnesium clinical literature
"supports restful sleep / sleep quality"
Partial
Some evidence magnesium aids sleep in deficient people, not everyone
Based on: Magnesium Glycinate
Source: General magnesium clinical literature
"muscle and nerve function support"
Supported
Magnesium and zinc are established cofactors for muscle/nerve function
Based on: Magnesium Glycinate, Zinc Picolinate
Source: Examine.com/PubMed general nutrient physiology
"maximum absorption / gentle on stomach"
Supported
Glycinate form is well-documented as gentler than oxide/citrate forms
Based on: Magnesium Glycinate
Source: General magnesium bioavailability literature
2 supported · 2 partial
Signals
- Shows actual ingredient doses
Ingredients
Based on peer-reviewed research from PubMed and Examine.com
Magnesium Glycinate
Essential minerals that regulate hydration, nerve function, and muscle contraction. Critical for recovery after heavy exercise.
Research-backed dose: 200-400mg elemental magnesium commonly used in sleep/relaxation studies; RDA is 310-420mg/day
In this product: 120 mg
Vitamin D (as cholecalciferol)
Essential fat-soluble vitamin. Supports bone health, immune function, and may improve exercise tolerance in deficient individuals.
Research-backed dose: 400–80,000 IU daily depending on condition and deficiency status
In this product: 6.25 mcg (250 IU)
Vitamin B6 (as pyridoxal-5-phosphate)
Essential B vitamin that supports metabolism, brain function, and immune health. Deficiency causes real harm.
Research-backed dose: 1.3–2.0 mg/day (dietary reference intake); therapeutic doses up to 100 mg/day studied for specific conditions
In this product: 2.125 mg
A highly absorbable form of zinc. May help taste disorders and antioxidant balance, but most benefits are modest.
Research-backed dose: 22-87 mg elemental zinc daily (form-dependent; no universal consensus from provided studies)
In this product: 10 mg
A highly absorbable form of zinc. May help taste disorders and antioxidant balance, but most benefits are modest.
Research-backed dose: 22-87 mg elemental zinc daily (form-dependent; no universal consensus from provided studies)
In this product: Dose not disclosed
Safety & side effects
What NIH says about the ingredients in this product. This describes the ingredients, not tests of this product, and it is not medical advice. Ask a doctor or pharmacist first if you take medication, are pregnant or nursing, or have a health condition.
Magnesium
Magnesium from food poses no health risk in healthy people, because the kidneys clear the excess. High doses from supplements or medications can cause diarrhea, nausea and abdominal cramping, and very high doses can lead to toxicity.
Possible side effects
- High doses from supplements or medications can cause diarrhea, nausea, and abdominal cramping.
- Magnesium carbonate, chloride, gluconate, and oxide are the forms most commonly reported to cause diarrhea.
Serious risks
- Very high doses can lead to magnesium toxicity, with low blood pressure, vomiting, difficulty breathing, irregular heartbeat, cardiac arrest and other signs.
- A few cases of fatal hypermagnesemia have been reported.
- Very large doses of magnesium-containing laxatives and antacids have been associated with magnesium toxicity.
- The risk of toxicity increases with impaired kidney function or kidney failure.
Avoid or ask a doctor first if
- People with impaired kidney function or kidney failure face higher risk of magnesium toxicity.
- People taking medications regularly should discuss their magnesium intake with their health care providers.
Medication interactions
- Magnesium may interact with oral bisphosphonates, tetracyclines, and quinolone antibiotics.
- Some medications, including diuretics and proton pump inhibitors, can affect magnesium status.
Upper limit: 350 mg a day for adults 19+. This label lists 120 mg.
Source: NIH Office of Dietary Supplements, Magnesium: Fact Sheet for Health Professionals
Vitamin D
Vitamin D toxicity is almost always caused by excessive supplement intake. It can raise blood calcium and, in extreme cases, lead to kidney failure and death. The adult upper limit is 100 mcg (4,000 IU) a day.
Possible side effects
- High blood calcium from vitamin D toxicity can lead to nausea, vomiting, muscle weakness, and other symptoms.
Serious risks
- Toxicity can cause high blood and urine calcium. In extreme cases it may lead to kidney failure, soft tissue calcification, heart rhythm problems, and death.
- Toxicity is almost always caused by taking too much vitamin D through supplements.
Avoid or ask a doctor first if
- The source says people on regular medications should talk with their health care providers about vitamin D intake and status.
Medication interactions
- Vitamin D supplements may interact with orlistat, statins, steroids, and thiazide diuretics.
- Taking calcium supplements with vitamin D supplements may raise the risk of certain adverse effects.
Upper limit: 100 mcg a day for adults 19+. This label lists 6.25 mcg (250 IU).
Source: NIH Office of Dietary Supplements, Vitamin D: Fact Sheet for Health Professionals
Zinc
Zinc from food is unlikely to cause toxicity. High intakes, mostly from supplements, can cause stomach and other symptoms, and doses of 50 mg or more over weeks can interfere with copper absorption. The adult upper limit is 40 mg.
Possible side effects
- High zinc intakes can cause nausea, dizziness, headaches, gastric distress, vomiting, and loss of appetite.
Serious risks
- Doses of 50 mg or more taken for weeks can interfere with copper absorption, reduce immune function, and lower HDL cholesterol.
- Very high supplemental doses (142 mg/day) might interfere with magnesium absorption and disrupt magnesium balance.
- According to a few reports, overuse of zinc-containing denture adhesive creams can lead to neurological symptoms and anemia.
Avoid or ask a doctor first if
- The upper limits don't apply to people receiving zinc for medical treatment, who should be under a physician's care.
- Zinc-free denture adhesive formulations are available to prevent the effects linked to zinc-containing creams.
Medication interactions
- Zinc may interact with quinolone antibiotics, tetracycline antibiotics, and penicillamine.
- Some diuretics can lower serum zinc by increasing zinc excretion in urine.
- People taking medications regularly should discuss their zinc status with their health care providers.
Upper limit: 40 mg a day for adults 19+. This label lists 10 mg.
Source: NIH Office of Dietary Supplements, Zinc: Fact Sheet for Health Professionals
Price & Value
ModerateDr. Berg Magnesium Glycinate with Vitamin D3
$18.99 (90 capsules, one-time)
Doctor's Best High Absorption Magnesium Glycinate or Nature Made Magnesium
$10-15 for 100-180 capsules
What you're actually paying for
This is a multi-ingredient blend at $0.21/capsule a serving. Comparable options: Any magnesium glycinate supplement (e.g., Doctor's Best, Nature Made), which run $10-15 for a similar count.
Worth paying for
- promotes relaxation / targeted stress relief
- supports restful sleep / sleep quality
- muscle and nerve function support
- maximum absorption / gentle on stomach
Research sources: PubMed · Examine.com
Analyzed product: https://shop.drberg.com/products/magnesium-glycinate
Analysis generated: 2026-10-28 · Engine v1.0.0
Frequently Asked Questions
Is Dr. Berg Magnesium Glycinate with Vitamin D3 worth the money?
Dr. Berg Magnesium Glycinate with Vitamin D3 at $18.99 (90 capsules, one-time) appears to offer reasonable value based on its ingredient quality and dosing. This is a straightforward magnesium glycinate supplement with vitamin D3, B6, and zinc added at clearly labeled, non-excessive doses. The core claims — relaxation and sleep support — are modestly worded and align reasonably well with what magnesium glycinate is known to do, especially for people who are deficient.
Is Dr. Berg Magnesium Glycinate with Vitamin D3 a scam?
Dr. Berg Magnesium Glycinate with Vitamin D3 does not appear to be a scam. Our analysis found the claims are generally supported by the ingredients.
What are the ingredients in Dr. Berg Magnesium Glycinate with Vitamin D3?
Dr. Berg Magnesium Glycinate with Vitamin D3 contains 5 ingredients including Magnesium Glycinate, Vitamin D (as cholecalciferol), Vitamin B6 (as pyridoxal-5-phosphate), Zinc (as zinc picolinate), Zinc Picolinate.
Does Dr. Berg Magnesium Glycinate with Vitamin D3 actually work?
Yes, Dr. Berg Magnesium Glycinate with Vitamin D3 can work for its intended purpose. 2 of 4 claims are fully supported. 2 are partially supported.
Are there cheaper alternatives to Dr. Berg Magnesium Glycinate with Vitamin D3?
Yes, Doctor's Best High Absorption Magnesium Glycinate or Nature Made Magnesium at $10-15 for 100-180 capsules offers similar benefits at a better price point. Many key ingredients in Dr. Berg Magnesium Glycinate with Vitamin D3 are available separately for less.
Does Dr. Berg Magnesium Glycinate with Vitamin D3 have side effects?
NIH summaries of the ingredients in Dr. Berg Magnesium Glycinate with Vitamin D3 note these possible effects. Magnesium: High doses from supplements or medications can cause diarrhea, nausea, and abdominal cramping. Vitamin D: High blood calcium from vitamin D toxicity can lead to nausea, vomiting, muscle weakness, and other symptoms. Zinc: High zinc intakes can cause nausea, dizziness, headaches, gastric distress, vomiting, and loss of appetite. This describes the ingredients, not tests of this