1
Selenium source
SelenoExcell®
SelenoExcell® is a selenium-enriched yeast ingredient. Selenium is an essential trace mineral used by antioxidant enzymes, including glutathione peroxidases. It also contributes to normal immune and thyroid function.
GRSUltra Review 2026
GRSUltra: daily glutathione support for cellular antioxidant defense
GRSUltra is a daily supplement built around three ingredients that support the body’s natural antioxidant system: N-acetyl-cysteine (NAC), SelenoExcell® selenium and Red Orange Complex®. Each bottle contains 60 capsules, enough for a 30-day supply.
- Supports the body’s natural production of glutathione
- Includes NAC, SelenoExcell® and Red Orange Complex®
- 60 capsules per bottle, designed as a 30-day supply
- Backed by a 365-day money-back guarantee
Affiliate disclosure: if you buy through a product link on this page, this site may earn a commission at no extra cost to you.
Brand
Simple Promise
Format
60 capsules
Core Formula
Selenium + NAC + ROC®
Guarantee
365-day money back
GRSUltra at a glance
A compact formula built around glutathione and everyday antioxidant support.
GRSUltra keeps the formula simple. NAC provides cysteine, selenium supports glutathione-related enzymes, and Red Orange Complex® adds citrus polyphenols. The result is a two-capsule daily routine designed for people who want targeted cellular support without a long list of added ingredients.
Daily routine2capsules per day
60 capsules per bottle
60 capsules per bottle
What is GRSUltra?
A three-ingredient approach to supporting your natural glutathione system
GRSUltra is designed to support cellular antioxidant defenses from within.
GRSUltra is a dietary supplement from Simple Promise. Its formula centers on glutathione, one of the body’s key antioxidants. Glutathione helps cells handle everyday oxidative stress, and the body makes it naturally using nutrients and amino acids.
Instead of filling the capsule with a long blend, GRSUltra uses three featured ingredients with complementary roles. NAC supplies cysteine, an amino acid used to make glutathione. SelenoExcell® provides selenium, a mineral needed by glutathione-related antioxidant enzymes. Red Orange Complex® supplies citrus polyphenols from Mediterranean red oranges.
Each bottle contains 60 capsules. The daily serving is two capsules, giving you a full 30-day supply in one bottle. It is stimulant-free, caffeine-free and designed for consistent daily use.
Want the full formula breakdown? See the GRSUltra ingredients page for a closer look at NAC, selenium and Red Orange Complex®.
GRSUltra Ingredients
Three core ingredients that work in different ways
The formula combines a glutathione precursor, an essential mineral and antioxidant-rich citrus compounds.
2
Glutathione precursor
N-acetyl-cysteine (NAC)
NAC supplies cysteine, one of the amino acids your body uses to make glutathione. It is one of the best-known nutritional ingredients used to support glutathione production and antioxidant status.
3
Citrus polyphenols
Red Orange Complex®
Red Orange Complex® is derived from Moro, Tarocco and Sanguinello red oranges. These fruits naturally contain anthocyanins, flavonoids and other plant compounds associated with antioxidant activity.
Why the combination makes sense: NAC helps provide a building block for glutathione, selenium supports enzymes that use glutathione, and Red Orange Complex® adds plant-based antioxidant compounds. GRSUltra brings all three into one daily formula.
GRSUltra Benefits
What GRSUltra is designed to support
The formula focuses on antioxidant protection, cellular function and steady everyday wellness support.
Glutathione support
NAC supplies cysteine while selenium supports glutathione-related enzymes, giving the formula a clear focus on your body’s own antioxidant system.
Cellular antioxidant defense
GRSUltra combines mineral, amino-acid and citrus support to help the body defend cells against everyday oxidative stress.
Energy and healthy aging support
Because the formula is stimulant-free, it is intended to support normal cellular function without relying on caffeine or a short-lived energy spike.
How long should you give it?
GRSUltra is not a stimulant or a quick-fix product. A consistent daily routine matters more than looking for an immediate sensation after the first dose. Many supplement users prefer to give a formula 30 to 90 days before deciding how well it fits their routine.
For a deeper look at the formula and expected benefits, visit does GRSUltra work? and GRSUltra benefits.
Before you choose
What stands out about GRSUltra
A focused formula, simple daily use and a long guarantee are the main reasons people consider it.
Why people choose it
- Focused three-ingredient formula
- Includes branded SelenoExcell® and Red Orange Complex®
- Contains NAC to support glutathione production
- Two capsules per day with 60 capsules in each bottle
- Stimulant-free and caffeine-free
- 365-day money-back guarantee
- Lower per-bottle price on longer supply packages
Things to know first
- GRSUltra is a dietary supplement, not a replacement for medical treatment
- Results can vary from one person to another
- Consistency matters more than expecting an instant effect
- Selenium should not be overused across multiple supplements
- NAC can interact with some medicines
- Talk with a healthcare professional if you take medication or manage a medical condition
Customer Feedback
What GRSUltra customers are saying
Customer feedback includes long-term users, people just getting started and customers returning to GRSUltra after time away.
Long-term user
Consistent GRSUltra routine
One long-term customer described GRSUltra as a product they had used consistently for years and continued to keep in their daily routine.
New user
Early-stage experience
A newer customer said it was still too early to judge fully after the first week, but they were giving the formula time and watching for changes in sleep and energy.
Returning user
Started GRSUltra again
A returning customer said they had used GRSUltra for years, later stopped, and chose to restart because they felt it had been a positive part of how they felt.
Customer comments are paraphrased for clarity. Individual experiences vary and do not guarantee the same result for everyone.
GRSUltra Price
Choose your GRSUltra package
Pick the supply length that fits your routine. Longer packages reduce the price per bottle.
SAMPLER PACKAGE
1-MONTH SUPPLY
SAVE$40
$49.95
/EACH
FAST & FREE SHIPPING
365-DAY MONEY-BACK GUARANTEE
GUARD MY HEALTH
BEST SELLER!
6-MONTH SUPPLY
SAVE$340
$33.33
/EACH
FAST & FREE SHIPPING
365-DAY MONEY-BACK GUARANTEE
GUARD MY HEALTH
MOST POPULAR!
3-MONTH SUPPLY
SAVE$150
$39.98
/EACH
FAST & FREE SHIPPING
365-DAY MONEY-BACK GUARANTEE
GUARD MY HEALTH
Every package includes fast and free shipping and the 365-day money-back guarantee.
365-Day Guarantee
A full year to try GRSUltra with money-back protection
Every GRSUltra order is covered by a 365-day money-back guarantee. That gives you time to use the formula consistently and decide whether it belongs in your daily routine.
If you are not satisfied during the guarantee period, you can request a refund under the return policy. Keep your order details so the process is easier if you ever need them.
- 365 days of money-back protection
- Applies to your GRSUltra order
- Designed to give you time to try the formula consistently
See the GRSUltra money-back guarantee page for more details.
Where to buy GRSUltra
Order GRSUltra online and choose the package that fits you
The 1, 3 and 6-month options are available through the GRSUltra order page. Enter your delivery details at checkout to complete your order.
United StatesOrder online
United KingdomCheck delivery at checkout
CanadaCheck delivery at checkout
AustraliaCheck delivery at checkout
New ZealandCheck delivery at checkout
GRSUltra Side Effects & Safety
What to know before adding GRSUltra to your routine
Check with a healthcare professional before using GRSUltra if you take medication or manage a medical condition.
NAC and selenium are biologically active. Selenium can cause toxicity when total intake becomes too high. NAC can cause digestive symptoms in some people and can interact with certain medicines. Citrus-derived ingredients may also be unsuitable for people with specific allergies or sensitivities.
- Avoid doubling up on high-dose selenium products without checking your total intake.
- Ask a clinician or pharmacist about NAC if you use prescription medicines, especially medicines that affect blood pressure, bleeding risk or nitrate therapy.
- If you are pregnant, breastfeeding, preparing for surgery or managing a serious condition, get professional advice first.
- Stop using the product and seek medical advice if you develop a concerning reaction.
For a fuller safety breakdown, see GRSUltra side effects.
GRSUltra FAQ
Common questions before ordering
What is GRSUltra?
GRSUltra is a Simple Promise dietary supplement focused on glutathione and antioxidant support. Its three highlighted ingredients are SelenoExcell® selenium, N-acetyl-cysteine and Red Orange Complex®.
How many capsules are in one bottle?
The bottle label shows 60 capsules and identifies one bottle as a 30-day supply. Follow the label directions on the bottle you receive.
How much does GRSUltra cost?
The 1-month supply is $49.95 each, the 3-month supply is $39.98 each and the 6-month supply is $33.33 each. The longer packages have the lower price per bottle.
Does GRSUltra have a 365-day guarantee?
Yes. GRSUltra orders include a 365-day money-back guarantee, giving you a full year of refund protection.
Where can I buy GRSUltra?
GRSUltra can be ordered online. Choose the 1, 3 or 6-month package and complete your delivery details at checkout.
Is GRSUltra sold on Amazon or Walmart?
GRSUltra is available through online channels. If you want the package pricing and 365-day guarantee shown here, use the GRSUltra order page linked on this site.
What does NAC do in GRSUltra?
NAC supplies cysteine, an amino acid used in glutathione synthesis. It has been studied extensively, but the result for any individual depends on dose, health status and other factors.
Can GRSUltra replace medication?
No. GRSUltra is a dietary supplement, not a substitute for prescribed treatment. Do not stop or change medication based on supplement marketing.
Does GRSUltra work for everyone?
No supplement can promise the same result for everyone. The formula includes ingredients with research behind them, but that does not guarantee a specific outcome from the finished product.
Which bundle offers the lowest cost per bottle?
The 6-month package has the lowest price per bottle at $33.33 each.
How the formula fits together
Three ingredients, one clear antioxidant-support strategy
GRSUltra is easier to understand when you look at the role each ingredient plays in the same pathway.
NAC provides cysteine. Cysteine is one of the amino acids needed for glutathione production, which is why NAC is commonly used in formulas built around antioxidant support.
SelenoExcell® provides selenium. Selenium is needed by glutathione peroxidase enzymes that help protect cells from oxidative stress. It complements NAC rather than simply repeating the same role.
Red Orange Complex® adds citrus polyphenols. The red-orange extract brings anthocyanins and flavonoids into the formula, giving GRSUltra a plant-based antioxidant component alongside NAC and selenium.
That is the main appeal of GRSUltra: the formula is short, but the ingredients are chosen to support different parts of the same overall antioxidant strategy.
Choose the GRSUltra package that fits your routine
Start with a 1-month supply or choose a longer package for a lower price per bottle. Every option includes fast and free shipping plus the 365-day money-back guarantee.
GUARD MY HEALTHThis site may earn a commission from qualifying purchases at no extra cost to you.