Blog
Melonex Arginine: Two Forms, One Blend, Capped Amounts
Melonex lists two forms of arginine, the alpha-ketoglutarate form second and the HCl form third. The label order caps them at 250 mg and 167 mg per capsule. Together they could be at most 417 mg of the 500 mg blend. Arginine has real cautions, including after a heart attack.
Written by the Melonex label deskUpdated · 4 min read
Which arginine forms does Melonex list?
Two: L-arginine (alpha-ketoglutarate dihydrate) in second place and L-arginine HCL in third.
The chart shows where each name can fall inside the 500 mg. Second place tops out at 250 mg and third at 167 mg, by the labeling rule 1. Neither has a printed amount.
500 mgone Proprietary Blend per capsule, amounts of the three names not printed
Proprietary Blend 500 mg- L-Citrulline DL-Malate167 to 500 mg
- L-Arginine alpha-ketoglutarateup to 250 mg
- L-Arginine HClup to 167 mg
Bars show the widest range the label order allows for each name 1. The real split is not printed.
How do the two forms compare?
Same amino acid, different partner molecule.
| Line | Partner | Cap per capsule |
|---|---|---|
| Second | Alpha-ketoglutarate | 250 mg |
| Third | Hydrochloride | 167 mg |
Pages on each: arginine AKG and arginine HCl. The two caps do not add up to a guarantee of 417 mg. They are ceilings, and the real amounts could sit far lower, because the first name only has to be at least 167 mg and could hold the rest of the blend.
Think of the 500 mg as a pie cut into three slices of unknown size. The label order only tells you the slices shrink from first to third. It does not tell you how big any slice is.
What did arginine trials use?
Grams. A pooled analysis of 22 trials saw an average systolic change of 6.40 mm Hg, with an effective dose of 4 g a day or more 2.
That is arginine on its own. One capsule here holds at most a few hundred milligrams of it, and the analysis did not test any blend. Another review calls the evidence mixed and limited.
Melonex: from $49 a bottle60 capsules · 2, 3 or 6 bottles · free US shipping on 3 and 6 · 60-day money-back guarantee
See packsWho should be careful with arginine?
Anyone who has had a heart attack, takes blood pressure medicine, or uses nitrates or sildenafil.
Points in its favor
- Generally considered safe by mouth in one reference 3
- Pooled trials of grams a day show small average changes
Call 911 for chest pain or stroke signs. Never stop prescribed medicine for a supplement. The blend page explains why the amounts are hidden. Potassium-sparing diuretics are also named on arginine interaction lists, and one source says not to combine them 3. Pharmacists can check this in a minute if you bring the bottle.
What is the sensible next step?
Ask a pharmacist, then decide. The label prints no arginine amount to judge by.
If you go ahead, take the label dose, keep a note of any bloating or dizziness and read the guarantee terms before the first order.
Free US shipping
3 bottles: 180 days
$207$69 a bottle · about $1.15 a day
Free US shipping · 60-day money back
Order 3 bottles
Lowest per bottle
6 bottles: 360 days
$294$49 a bottle · about $0.82 a day
Free US shipping · 60-day money back
Order 6 bottlesPrices on the Melonex sales page, October 30, 2026 5. Two bottles are also sold for $158, plus $9.99 shipping. Check your medicines with your doctor or pharmacist before you order.
FAQ01
Melonex questions people ask
Why does Melonex have two kinds of arginine?
The label does not explain. Each form is a salt of the same amino acid with a different partner, and the amounts are not printed.
How much arginine is in Melonex in total?
At most 417 mg per capsule, by the label order, though the real total could be much lower.
Can Melonex arginine cause bloating?
Arginine references list nausea, bloating and diarrhea as side effects, but no data exist for this capsule.
Is Melonex arginine safe after a heart attack?
References say arginine is not recommended after a recent heart attack. Ask your cardiologist.
Who wrote this02
Written and reviewed by
Pages built from the label, the sales page and linked NIH, FDA, CDC, FTC and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is the information site for a USA Authorized Melonex Retailer. It is not the manufacturer or the distributor named on the label. We earn money when you buy through our order links.
Keep reading
More about Melonex
USA Authorized Melonex Retailer
Ready to try Melonex?
Check your medicines first, especially blood-pressure medicine, then pick a pack. Six bottles cost the least per bottle; three and six ship free in the US; every pack carries the 60-day money-back guarantee.
- Secure checkout on the sales site
- 60-day money-back guarantee
- Ships from the U.S.