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LTH Flex Whey Protein Isolate

Fuel your body with clean, fast-absorbing protein. Flex Whey Isolate delivers 20 grams of ultra-filtered, cold-processed protein with less than 0.5g lactose and no added sugar — designed to support recovery, lean muscle, and satiety. Ideal for athletes and anyone who wants a smooth, low-fat source of high-quality protein that’s easy to digest and easy to love.*

  • 20g of fast-absorbing whey protein isolate per serving*
  • Ultra-filtered and lactose-free (<0.5g lactose)*
  • Helps build and maintain lean muscle*
  • Independently 3rd-party quality tested & NSF Certified for Sport
  • Non-GMO, no added sugar, and cold-processed*
  • 30 servings per container
$69.99
Free Shipping on orders over $99

Why You’ll Love It

Why You’ll Love It

Flex Whey Isolate makes it easy to power your day with clean, complete protein — without the unwanted extras. Sourced from high-quality whey isolate and cold-processed to preserve key amino acids, Flex helps your body rebuild and recover quickly after workouts while supporting lean muscle and steady energy. With a smooth, light texture and no synthetic sweeteners, colors, or flavors, it’s the perfect choice for everyday performance nutrition.*

Clean, Complete Protein for Performance*

  • Provides 20 grams of high-quality whey isolate protein to fuel recovery and lean muscle growth.*
  • Naturally rich in amino acids to support muscle protein synthesis and post-exercise repair.*


Easy to Digest, Fast to Absorb*

  • Ultra-filtered and lactose-free (<0.5g) for quick absorption and minimal bloating.*
  • Ideal for those with sensitive stomachs or looking for a clean, efficient protein source.*


Recovery and Satiety Support*

  • Helps rebuild muscle and replenish amino acids after exercise.*
  • Supports fullness and appetite control as part of a balanced diet.*


Quality You Can Trust

  • Non-GMO, cold-processed, and free from synthetic colors, flavors, and sweeteners.
  • Low in fat and sugar — just clean, efficient fuel for your active lifestyle.*


Tested & Trusted

  • Every batch tested for identity, purity, potency, microbes, heavy metals, and contaminants*
  • Manufactured in the USA in FDA-registered, GMP-certified facilities audited annually by third parties*
  • NSF Certified for Sport® — ensuring label accuracy and product quality*


*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

**If you’re pregnant, nursing, or taking any medications, please consult your doctor or medical provider before starting any supplements.

The No List

Not only do we take pride in what we put in our supplements, we also go to great lengths to avoid putting anything harmful or unnecessary in them. The following is our current list of ingredients we refuse to put in our supplements.

Acesulfame-K (Ace-K) • Aspartame • Banned substances • Benzoic acid • Butylated hydroxyanisole (BHA) • Butylated hydroxytoluene (BHT) • Bisphenol A (BPA) • Carmine (natural red 4) • Cyclamates • Eggs • Ephedra sinica (Ma Huang) • Erythritol • Ethyl vanillin • Ethylene oxide (ETO) • FD&C numbered color pigments • Gluten • Glycols (propylene glycol) • High fructose corn syrup (HFCS) • Hydrogenated oils (partially hydrogenated oil, trans-fats) • Irradiation • Peanuts • Polyethylene glycol (PEGs) • Propyl gallate • Saccharin • Sodium benzoate • Stearates (stearic acid, magnesium stearate) • Sucralose • Sulfites (potassium bisulfite, sodium sulfite) • Synthetic Vanillin • Tertiary buthylhydroquinone (TBHQ) • Titanium dioxide

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Frequently Asked Questions

Is this product gluten-free?

Yes. No gluten-containing ingredients are used in the formula, and every lot is tested to confirm it’s below 20ppm gluten.


Is this product vegan?

No, it contains whey protein sourced from cow’s milk.


What’s in the "Natural Flavors"?

Water or ethanol extracts of flavors from natural plant sources (such as vanilla bean).


How much protein should I consume?

Be sure to consult your doctor before making any significant change to diet or supplementation. For healthy individuals engaged in resistance training programs, a good estimate for protein needs is 1g of protein per pound of goal or ideal body weight per day, assuming they do not have kidney disease or other medical conditions that would warrant protein restrictions.
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