The Gym BagHull + Mast$62.01$68.90
Knurle / Mast
For getting up and going
Mast Daily Energy & Stamina
- 400 mg shilajit: a 30:1 extract, printed on the label.
- Three more extracts: ashwagandha, sea moss and tongkat ali, 100 mg each.
- One capsule a day: thirty in the bottle, thirty days.
- Vegetable capsule: no gelatin.
4
Ingredients
1
Cap a day
30
Day supply
0
Blends
$35.0030 capsules · 30-day supply · about $1.17 a day
Add $50.00 more for free US shipping
$0.00 / $50.00
Made in the USA in an FDA-registered, GMP-certified facility. Ships from Colorado.
Buy it with
Vegetable capsuleNo caffeine
What this actually is
Mast is four concentrated extracts in one capsule. Shilajit leads at 400 mg, with ashwagandha root, sea moss and tongkat ali at 100 mg each.
Shilajit is a mineral-rich resin that seeps out of mountain rock, mostly in the Himalayas, and it has been part of traditional practice for centuries. The label prints each extract with its ratio, so 30:1 means thirty parts of raw material became one part of extract.
One a day, thirty in the bottle, so one bottle is one month. No caffeine, a vegetable capsule, and a glass of water to see it off.*
Where it is made
Made in the United States in an FDA-registered, GMP-certified facility, then packed and posted from Arvada, Colorado. The address on the label is ours, and there is usually a dog in the building.
Made in the USA
FDA-registered facilityGMP certifiedEvery dose printedOne job per bottleThird-party tested
FDA-registered facilityGMP certifiedEvery dose printedOne job per bottleThird-party testedThe short version
Twenty seconds, one capsule with a face.
Pip walks through what is in the bottle and how much of it, straight off the label. Sound is off until you tap it, which we think is only polite.
Per capsule serving
Here it is, drawn to scale.
Four extracts drawn to scale, shilajit out in front. None of them has an official Daily Value, so it is milligrams all the way down.
Ingredient, per capsule% Daily Value
** Daily Value not established. Other ingredients: HPMC (vegetable capsule), Nu-FLOW®, olive oil.
How to take it.
No loading phase, no cycling, no chart on the fridge. One capsule and a glass of water.
One capsule, one glass of water
Six to eight ounces does it. Morning is the popular spot.
Same time, most days
Pin it to the kettle or the morning coffee. Turning up is the whole trick.
Somewhere cool and dry
Not the bathroom. Skip it if the seal is broken. Keep out of reach of children.
Reviews4.8 · 5 reviews
Real customers, verified where marked. The whole spread is here, so have a proper scroll.
4.8★★★★★5 reviews
100%would recommend itrated it four stars or better
5 showing
★★★★★
Endurance for long cycling days
Took Mast throughout my weekend 50-mile rides. Solid aerobic stamina and zero cramping or mid-ride bonking.
★★★★★
Way better than sugary energy drinks
Replaced my 11 AM pre-workout drink with Mast. Smooth, sustained physical energy that lasts through busy afternoons.
★★★★☆
Great stamina, bummed it's sold out
Really high quality formula for active days. Only docked a star because inventory has been hard to catch lately.
★★★★★
Helps push through long shifts
I work 12-hour hospital shifts. Mast keeps my physical endurance intact without making my heart race.
★★★★★
Clean, consistent physical drive
You don't feel an aggressive spike; you just realize hours into physical activity that you aren't running on empty.
The studies behind it.
Four papers worth knowing about, written up in plain English. They test the ingredients rather than this exact bottle, and where that difference matters we have said so.
01
Shilajit and the stronger half
Sixty-three active men took 250 mg or 500 mg of shilajit a day, or a placebo, for eight weeks. Among the men who started out stronger, the 500 mg group held on to more of their strength after a tiring workout: an 8.9% drop against 16.0% on placebo.
How strong2/5
The catchThat showed up only in the stronger half of the group, and 250 mg did nothing. Mast has 400 mg of a 30:1 extract, which is a different preparation from the one in the trial.
02
Ninety days, men of 45 to 55
A randomised, double-blind, placebo-controlled trial gave healthy men aged 45 to 55 purified shilajit, 250 mg twice a day, for 90 days. Total testosterone, free testosterone and DHEAS all rose compared with placebo.
How strong3/5
The catchBlood readings moved. The trial did not measure how anybody felt, and it used a purified shilajit at 500 mg a day.
03
Tongkat ali and a stressful month
Sixty-three moderately stressed adults took 200 mg of tongkat ali root extract a day, or a look-alike placebo, for four weeks. Tension scores fell 11%, anger 12% and confusion 15%. Cortisol in saliva fell 16%.
How strong3/5
The catchThat was 200 mg of one branded extract. Mast has 100 mg of a 300:1 extract, so the two are not the same measure.
04
The tongkat ali trials, pooled
A 2022 systematic review found nine studies of tongkat ali and testosterone, and pooled the five randomised trials. Taken together, total testosterone rose significantly in the men taking it.
How strong3/5
The catchFive trials is a small pile, and they used different extracts and doses from each other and from Mast.
Shipping.
Everything is made and packed in the United States, and your order sets off from a facility in Colorado. Free US shipping once you spend $50.
United States
2-4business daysby USPS
$5.95 standard, $10.99 express
Free over $50. USPS Ground Advantage in 2 to 4 business days, or Priority in 1 to 3. Alaska and Hawaii are not served yet.
Mast ships within the United States only.
Things people ask.
01When should I take Mast?
One capsule a day with 6-8 oz of water. Morning is the popular spot, since this is the get-up-and-go bottle. Same time most days is the part that matters.
02What is in Mast, and how much of each?
Per capsule: shilajit extract 30:1 at 400 mg, ashwagandha root extract 30:1 at 100 mg, sea moss extract 20:1 at 100 mg and tongkat ali root extract 300:1 at 100 mg. All four are printed on the label with their ratios.
03What do the ratios mean?
A ratio like 30:1 means thirty parts of raw material were concentrated down to one part of extract. It tells you how concentrated the extract is. It is not the same as a standardised percentage of one compound.
04Is there caffeine in Mast?
No. There is no caffeine and no other stimulant on the label.
05Can I take Mast with Cove or Keel?
Add up the ashwagandha first. Mast has 100 mg of ashwagandha extract, Cove is 1,300 mg of ashwagandha root a day and Keel has some in its Energy blend. Pick one ashwagandha bottle unless your clinician says otherwise.
06Should anyone skip it?
Do not take Mast if you are pregnant or nursing. Talk to your clinician first if you have a thyroid condition or a hormone-sensitive condition, or take thyroid, blood pressure, blood sugar or immune-suppressing medicine. Sea moss is a natural source of iodine.
Asked something we have not answered? Write to us and an actual person writes back, usually the same day, occasionally with too much detail.
Ask us anything
One capsule, thirty days
One bottle, and then not thinking about it.
$35.00 for 30 capsules, every milligram printed on the label, and free US shipping once you spend $50.
