SKU: 23773783420

First Endurance OptygenHP

Sale price$71.95 Regular price$79.95
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Ships within 48 hours · Estimated delivery Jul 12 - Jul 17

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Description

First Endurance OptygenHPFirst Endurance names this "the ultimate endurance supplement." Why? The OptygenHP is the new and improved Optygen formula and features their exclusive OptyMax Proprietary Matrix. Clinical research on elite endurance athletes shows an increase in VO2max, an increase in the bodys ability to adapt to high levels of physical stress, an increase in anaerobic threshold, and a reduction in lactic acid. These studies showed: A 26% decrease in cortisol levels

First Endurance names this "the ultimate endurance supplement." Why? The OptygenHP is the new and improved Optygen formula and features their exclusive OptyMax Proprietary Matrix. Clinical research on elite endurance athletes shows an increase in VO2max, an increase in the body’s ability to adapt to high levels of physical stress, an increase in anaerobic threshold, and a reduction in lactic acid. These studies showed:

  • A 26% decrease in cortisol levels
  • A 42% increase in time to lactate threshold,
  • A significant improvement in endurance capacity
  • A significant increase in energy (ATP) production.

Athletes who participated in these studies were able to replenish glycogen faster, which leads to improved recovery and improved performance on back-to-back workouts and during heavy training. In addition, subjects experienced less muscle inflammation after high-intensity exercise, resulting in less soreness and faster recovery. The main adaptogens in Optygen HP were first used by Tibetan Sherpas to help them climd Mt. Everest, so we know they’ve been working their magic for a long time.

How We Use It

We take 4 capsules daily with a meal. Daily use promotes increased athletic performance and faster recovery. These will not work if you just take them a few days leading up to an event. To receive their full benefit, long-term use (greater than one month) is recommended.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 23773783420

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4.3 ★★★★★
Based on 1764 reviews
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Amazon Customer
Phoenix, US
★★★★★ 3
Ehh
Size: Medium, Color: Multicoloured E-(5-pack)
Very thin, still comfy but very thin material. Super soft though. I've worn and washed and they have held up but I won't be repurchasing bc these are so thin
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Reviewed in the United States on April 14, 2026
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Grma4m&m
Battle Creek, US
★★★★★ 5
They’re fantastic!!!!
Size: X-Large, Color: Multicoloured E-(5-pack)
My clothing size is 16/18 and XL. Even though Amazon suggested a size XXL, I ordered my normal XL and they fit perfectly. The fabric for this style is 92% bamboo viscose and is amazingly soft and almost silky feeling. I had ordered a different boy short in this brand but they were 80% bamboo viscose and the fabric was significantly heavier. I returned those and ordered these.
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Reviewed in the United States on April 25, 2026
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Liz Newman
Chelsea, US
★★★★★ 5
Comfortable and cool. Does not ride up.
Color: 01-multicolour (4-pack), Size: Medium
Extremely comfortable. Stays cool. Ample coverage. Quality material. They do not creep up. I ordered a medium which I generally take a size small. I have reordered and will reorder again to add more colors to my collection.
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Reviewed in the United States on May 18, 2026
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Janola
West Palm Beach, US
★★★★★ 5
Great Value for Cool Thigh Protection
Color: 02-multicolour (4-pack), Size: XX-Large
For the price, I'm not sure there are better women's boxer shortlettes anywhere. I've tried more expensive brands, and for quality and cooling, these are right up there. I have other bamboo viscose undies that still get gross when I get sweaty in the summer, but these, with the large mesh panel, really help wick away a lot of that moisture, keeping you feeling dryer and cooler. I find that the leg openings are comfortable and don't roll up! and the waist band doesn't dig, nor does it roll down. These do not provide any compression, and I wasn't looking for any. I just wanted some cooling, thigh protecting women's boxers that wouldn't break the bank. These are them! Bonus- I've washed them and put them in the dryer (following their instructions), and they haven't shrunk; they look about the same and are nice and soft.
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Reviewed in the United States on July 28, 2025
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Reviewer
Carnegie, US
★★★★★ 4
Great for the entire family but expensive
So far so good. The brand of boxers we had been buying changed their style and construction so we needed to find an alternative. These have held up well so far to multiple weeks of frequent washing and wearing from the entire family. We did size up from the usual 6/M we normally buy and ordered large to prevent the legs from rolling up which worked out great. Our daughter likes the length and how soft the fabric is for wearing under skirts and gym shorts and liners stay put without moving or leaking as another reviewer mentioned. Our son says they are comfortable and fit well being just supportive enough without being constrictive. We all agree that there seems to be not enough fabric in the back as they tend to be much tighter across the backside than the front and that also causes the waist band to ride lower in the back than the front. These have better seam placement than some brands we tried with no seam across the lady bits and no seam down the middle of the back side so they are more much comfortable but the cost is also much higher and that is why we're only giving it 4 stars. These will stay in the rotation until we find something cheaper that both us and the kids like.
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Reviewed in the United States on January 24, 2026

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