SuppHelper
search
Home›Supplements›Mineral›Magnesium›Magnesium Oxide 400 mg Rugby
Product Image

Magnesium Oxide 400 mg

Rugby
4.7
★ ★ ★ ★ ★
(14 ratings)
Magnesium 240 mg
Product Image
Score 55

A very affordable Magnesium Oxide supplement, primarily suited for digestive regularity due to its lower absorption rate for systemic benefits.

scaleQuantity:120 Tablet(s) • (120 servings)
track_changesGoals:
flag Digestive Health
flag General Health
flag Anti-Aging
flag Anti-Inflammatory Support
flag Bone Health
flag Brain Health
flag Cardiovascular Support
flag Cognitive Support

leaderboard Score 55

A very affordable Magnesium Oxide supplement, primarily suited for digestive regularity due to its lower absorption rate for systemic benefits.

insightsAnalysis

This product provides Magnesium Oxide in a tablet form, offering 240mg of elemental magnesium per serving. Magnesium oxide is a common and affordable form of magnesium supplement.

It is important to understand that while Magnesium Oxide contains a high percentage of elemental magnesium, its absorption rate by the body for systemic use is generally quite low. This means that a significant portion of the magnesium might not be utilized for cellular processes.

This type of magnesium is often used when a laxative effect is desired, as unabsorbed magnesium can draw water into the intestines. It can be a budget-friendly option for those primarily seeking digestive support, but less ideal for addressing systemic magnesium needs.

thumb_upPros
  • Very economical option with a low price per serving.
  • Contains a high amount of elemental magnesium per dose.
  • Can be effective for promoting digestive regularity.
thumb_downCons
  • Poor bioavailability for systemic magnesium repletion.
  • May cause digestive upset or have a laxative effect.
  • Less suitable for supporting general health goals beyond digestive needs.
warningWarnings
  • May cause loose stools or diarrhea, especially at higher doses.
  • Not the most effective choice for increasing magnesium levels in the body for systemic benefits.
  • Consult a healthcare professional if you experience persistent digestive discomfort.
flagReport analysis
$9.20($0.07 per serving)
Walmart
$ 9.20
flagReport prices
track_changesGoals
flagDigestive Health
Impact
High effect
Magnesium Oxide can be effective for digestive health, specifically as an osmotic laxative. It draws water into the colon, which helps soften stools and promote bowel movements.
View goal →
flagGeneral Health
Impact
Moderate effect
While inexpensive, the poor bioavailability of Magnesium Oxide significantly limits its ability to contribute to general health by correcting systemic magnesium deficiencies. It primarily serves a localized digestive purpose.
View goal →
flagHeart Health
Impact
Moderate effect
While magnesium is important for heart health, Magnesium Oxide's poor absorption means it is not an effective way to replenish magnesium levels for cardiovascular support. Other forms are much better suited.
View goal →
flagAnti-Aging
Impact
Moderate effect
Magnesium Oxide provides minimal systemic magnesium support due to low absorption, therefore its contribution to broad anti-aging cellular processes is very limited compared to more bioavailable forms.
View goal →
flagCardiovascular Support
Impact
Moderate effect
Magnesium Oxide is not an ideal choice for cardiovascular support because its poor bioavailability means insufficient magnesium reaches the bloodstream to impact heart and vessel function effectively.
View goal →
flagFitness
Impact
Moderate effect
For fitness goals requiring systemic magnesium for muscle function, energy, and recovery, Magnesium Oxide is generally ineffective due to its low absorption rate into the body's tissues.
View goal →
flagCognitive Support
Impact
Moderate effect
Magnesium Oxide has very limited bioavailability for systemic use, and therefore is not expected to provide meaningful cognitive support as it does not readily cross the blood-brain barrier in sufficient quantities.
View goal →
flagMood Support
Impact
Moderate effect
Magnesium Oxide's poor absorption means very little elemental magnesium is available to influence neurological pathways for mood support. More bioavailable forms are necessary for this benefit.
View goal →
scienceIngredients
IngredientAmount per serving
elemental Magnesium
240 mg
person Adults 18–50
flagReport overview
Magnesium 55
This is a basic magnesium supplement using Magnesium Oxide, which is known for its poor bioavailability for systemic use. While very affordable, it's generally not recommended for addressing overall magnesium deficiency, instead often being used for its laxative effect.
scienceView ingredientinventory_2View products
inventory_2Alternative products
80 Value

Magnesium Chelate Complex 100 mg

Source Naturals
4.8
★★★★★
(7684 ratings)
Offers a significantly higher quality magnesium chelate at a very low price, delivering exceptional value compared to magnesium oxide.
Other sellers (1)
65 Value

Magnesium 250 mg

21st Century
4.7
★★★★★
(70201 ratings)
Provides a magnesium oxide supplement at a comparable very low price but with a higher analysis score, offering better quality for value.
Other sellers (0)
75 Value

Magnesium Complex 500 mg

Nature's Way
4.8
★★★★★
(7940 ratings)
A blend of magnesium citrate and oxide that provides significantly better bioavailability and a higher score for its competitive price, offering excellent value.
Other sellers (3)
90 Performance

Chelated Magnesium 133 mg

Swanson
4.8
★★★★★
(10236 ratings)
Significantly better due to its highly bioavailable TRAACS magnesium bisglycinate chelate form, offering superior absorption compared to magnesium oxide.
Other sellers (0)
85 Performance

Vegan Cal Mag Plus

DEVA
4.7
★★★★★
(899 ratings)
A better alternative with chelated magnesium and additional vitamins/minerals, providing broader health benefits and better bioavailability than magnesium oxide.
Other sellers (4)
82 Performance

Magnesium Citrate Pure Powder

Best Naturals
4.4
★★★★★
(126 ratings)
Offers a more bioavailable magnesium citrate form in powder, providing better absorption and flexibility compared to the less absorbable magnesium oxide.
Other sellers (0)
15 Budget

Magnesium & Calcium

NOW
4.8
★★★★★
(33549 ratings)
Offers a combination of magnesium and calcium at an extremely low price per serving, making it a very economical choice for basic mineral support.
Other sellers (6)
15 Budget

Magnesium & Calcium

NOW
4.8
★★★★★
(33549 ratings)
Another highly affordable option from NOW, combining magnesium and calcium to deliver foundational mineral benefits at a very accessible price.
Other sellers (5)
40 Budget

Magnesium Orotate 500 mg

Advanced Research
4.5
★★★★★
(13 ratings)
Provides magnesium orotate, a form known for good bioavailability, at a lower price per serving than the original product.
Other sellers (0)
80 Value

Magnesium Chelate Complex 100 mg

Source Naturals
4.8
★★★★★
(7684 ratings)
Offers a significantly higher quality magnesium chelate at a very low price, delivering exceptional value compared to magnesium oxide.
Other sellers (1)
65 Value

Magnesium 250 mg

21st Century
4.7
★★★★★
(70201 ratings)
Provides a magnesium oxide supplement at a comparable very low price but with a higher analysis score, offering better quality for value.
Other sellers (0)
75 Value

Magnesium Complex 500 mg

Nature's Way
4.8
★★★★★
(7940 ratings)
A blend of magnesium citrate and oxide that provides significantly better bioavailability and a higher score for its competitive price, offering excellent value.
Other sellers (3)
90 Performance

Chelated Magnesium 133 mg

Swanson
4.8
★★★★★
(10236 ratings)
Significantly better due to its highly bioavailable TRAACS magnesium bisglycinate chelate form, offering superior absorption compared to magnesium oxide.
Other sellers (0)
85 Performance

Vegan Cal Mag Plus

DEVA
4.7
★★★★★
(899 ratings)
A better alternative with chelated magnesium and additional vitamins/minerals, providing broader health benefits and better bioavailability than magnesium oxide.
Other sellers (4)
82 Performance

Magnesium Citrate Pure Powder

Best Naturals
4.4
★★★★★
(126 ratings)
Offers a more bioavailable magnesium citrate form in powder, providing better absorption and flexibility compared to the less absorbable magnesium oxide.
Other sellers (0)
flagReport alternatives

SuppHelper

Compare supplements smarter. Science-backed, user-rated, updated daily.

Explore

  • Compare Supplements
  • Health Goals
  • Stacks

Legal

  • Privacy Policy
  • Terms of Use
  • Medical Disclaimer

Stay in the Loop

Medical disclaimer: Information on SuppHelper is for educational purposes only and is not medical advice. Statements on this site about dietary supplements have not been evaluated by the Food and Drug Administration. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare professional before using supplements. Read full disclaimer

© 2025 SuppHelper. All rights reserved.