SteelFit Steel Hydrate: All 9 EAAs and Electrolytes in One Scoop

Mixing a BCAA product and a separate electrolyte drink? SteelFit Steel Hydrate combines both in one caffeine-free scoop with 8.1g of essential amino acids and 1g of taurine.

SteelFit Steel Hydrate is the next piece of SteelFit's 2026 relaunch: an EAA + BCAA electrolyte formula that covers amino acids and hydration in a single scoop. It follows the brand's new Steel Fuel pre-workout, and it's built to be caffeine-free, sugar-free, and free of artificial dyes.

The Old Steel Fuel Is Now Steel Hydrate

A quick naming note first: The original "Steel Fuel" was SteelFit's BCAA and hydration drink, built mostly on 2:1:1 BCAAs and taurine. That product has been reworked and renamed to Steel Hydrate here, while the Steel Fuel name moved to the new pre-workout that took over Steel Pump's old slot.

The rework goes well beyond a new name. The old Steel Fuel stopped at BCAAs, so the headline upgrade is the full essential amino acid profile: a 6g, 2:1:1 BCAA base plus 2.1g of the other six EAAs, for 8.1g of total EAAs per scoop. It's a profile we'd suggested to Rob a while back, as he mentioned when he joined us on Episode #239 of the PricePlow Podcast. SteelFit also adds 1g of taurine, coconut water powder, pink Himalayan salt, and 50mg of AstraGin.

The result is an amino-first formula with a lighter electrolyte base rather than a high-sodium sweat-replacement drink. SteelFit's graphics also list Informed Sport certification for drug-tested athletes, and as Rob explained on the podcast, the hydration formula is going through that process and should be certified soon, if it isn't already.

Steel Hydrate launches in Blue Raspberry and Pink Lemonade. Check prices and availability below, then let's dig into the formula:

SteelFit Steel Hydrate Ingredients

Each 1-scoop (12.7g) serving provides the following:

• Branched Chain Amino Acids (2:1:1) Blend - 6,000mg

  Steel Hydrate is built on a full 6g of branched-chain amino acids (BCAAs) in the classic 2:1:1 ratio. They're three of the nine essential amino acids, and they're the trio most closely tied to muscle-building signals. Taking BCAAs during and after resistance exercise boosted signaling through mTOR and p70 S6 kinase, two enzymes that switch on protein synthesis during recovery.^[1] In resistance-trained men, 5.6g of BCAAs taken right after training (slightly less than one scoop here) raised myofibrillar protein synthesis 22% over placebo.^[2]

  The recovery research lines up too. A 2025 review concluded that BCAA supplementation generally reduced muscle damage and soreness and helped preserve performance, with benefits depending on context, such as heavy training loads or energy restriction.^[3] The most formula-relevant trial paired BCAAs with taurine: in a study of 36 untrained men, 3.2g of BCAAs plus 2g of taurine taken three times daily, for two weeks before and three days after hard eccentric exercise, significantly reduced soreness, arm swelling, and blood markers of muscle damage compared to placebo.^[4] That study used more taurine per day than Steel Hydrate provides, but it's a direct precedent for combining the two.

  BCAAs on their own do have a ceiling. Building new muscle protein requires all nine essential amino acids, so a BCAA-only drink on an empty stomach leaves your body pulling the other six from muscle protein breakdown.^[5] Steel Hydrate's EAA Complex (below) is there to close that gap.

  Let's kick into each individual BCAA first:

  

  • L-Leucine - 3,000mg

    L-Leucine is the strongest anabolic trigger of the three. Cell research shows leucine is sensed directly by the protein Sestrin2, which releases its brake on mTORC1 signaling when leucine binds.^[6] In young men, a 3.42g dose of free leucine on its own (close to the 3g here) increased muscle protein synthesis by about 110%, and its metabolite HMB (β-hydroxy-β-methylbutyrate) produced a similar anabolic response.^[7]

  • L-Isoleucine - 1,500mg

    L-Isoleucine sends a weaker signal than leucine on its own, but it still pulls its weight in the blend. In a crossover study of trained lifters, the full BCAA trio produced greater post-workout S6K1 activity (a marker of muscle-building signaling) than leucine alone.^[8]

  • L-Valine - 1,500mg

    L-Valine completes the 2:1:1 ratio and shares in that BCAA signaling advantage. Its breakdown also produces β-aminoisobutyric acid (BAIBA), a signaling molecule that rises with exercise training and has been studied for its effects on fat metabolism in animal research.^[9]

• Essential Amino Acid Complex - 2,100mg

  This is the upgrade the old Steel Fuel never had. On top of the BCAAs, Steel Hydrate adds 2.1g of the remaining six essential amino acids (EAAs), bringing each scoop to 8.1g of total EAAs. The "9 EAAs" on the tub include the three BCAAs, so it's nine essential amino acids total, with 6g of them coming from BCAAs.

  

  The International Society of Sports Nutrition's position stand on EAAs concludes that free-form EAAs quickly raise blood amino acid levels to stimulate muscle protein synthesis, that the response starts at relatively small doses (1.5g to 3g at rest) and plateaus around 15g to 18g, and that non-essential amino acids aren't needed for it.^[10] The same position stand notes that repeated EAA doses throughout the day don't blunt the anabolic effect of your meals, which fits SteelFit's rest-day sipping directions. And in the signaling study above, the EAA drink produced a ninefold jump in post-workout S6K1 activity, beating both BCAAs and leucine alone, although the researchers credited much of that effect to the BCAAs it contained.^[8]

  Steel Hydrate's profile is intentionally BCAA-heavy, with BCAAs making up nearly 75% of its EAAs and the other six present in smaller amounts. Think of it as a training-window amino boost that complements your daily protein intake, not a replacement for it.

  • L-Lysine - 850mg

    L-Lysine is the largest dose in the complex. It's one of the most abundant amino acids in body proteins, yet it's in limited supply in many staple foods, grains in particular.^[11] Beyond building muscle protein, lysine residues are modified to help form the cross-links that stabilize collagen and elastin,^[12] and protein-bound lysine supplies the backbone of carnitine, the molecule that shuttles fatty acids into mitochondria for energy, with methionine donating the methyl groups.^[13]

    

    For perspective, the FAO/WHO/UNU lysine requirement is 30mg per kilogram of bodyweight daily (about 2.4g for an 80kg lifter), so one scoop covers roughly a third of it. Getting enough may matter for muscle function: in an 8-week metabolic-ward trial in young Indian men eating wheat-based diets (half of them undernourished), raising total lysine intake to 80mg/kg daily produced a small, roughly 7.5% improvement in muscle strength compared to lower intakes near their habitual levels, though muscle mass didn't change.^[14] Lysine is also well tolerated, with a systematic review of 71 studies setting a provisional no-observed-adverse-effect level of 6g per day.^[15]

  • L-Threonine - 600mg

    L-Threonine has an outsized job in your gut. In animal research, a large share of dietary threonine goes toward building intestinal proteins, especially mucins, the glycoproteins that form the gut's protective mucus layer, and because secreted mucins aren't digested and recycled, they're a steady net loss of threonine from the body.^[16] In rats, restricting dietary threonine specifically reduced mucin synthesis along the intestine, even though overall mucosal protein synthesis held steady.^[17] The gut's demand is highest early in life, but even in healthy adult men, about 18% of dietary threonine was taken up by the gut on its first pass.^[18]

    Adult needs are also higher than once thought. Controlled-feeding research put the average threonine requirement around 15mg/kg daily, roughly double the older 1985 FAO/WHO/UNU figure,^[19] which works out to about 1.2g for an 80kg adult, so one scoop covers roughly half. Threonine is well tolerated, too: a 2025 double-blind crossover trial identified a no-observed-adverse-effect level of 12g per day in healthy men.^[20]

  • L-Phenylalanine - 300mg

    

    L-Phenylalanine is an aromatic essential amino acid that the liver converts into tyrosine, the starting point for dopamine and norepinephrine. Tyrosine is the preferred substrate for that pathway at normal levels, though, so phenylalanine's main job here is filling out the protein-building profile.^[21]

  • L-Histidine - 150mg

    L-Histidine pairs with beta-alanine to form carnosine, a dipeptide that helps buffer acid in working muscle.^[22] Beta-alanine is the limiting building block, though, and research shows beta-alanine supplementation raises muscle carnosine without changing muscle histidine content.^[23] So if you're getting beta-alanine from Steel Fuel, the 150mg here is mostly about completing the EAA set.

  • L-Methionine - 100mg

    L-Methionine is the sulfur-containing essential amino acid that kicks off nearly every new protein chain your body builds, and its central position in protein metabolism makes it important for growing and maintaining lean mass.^[24] It's also the hub of sulfur metabolism. The body converts methionine into S-adenosylmethionine (SAMe), its main methyl donor, and through transsulfuration hands methionine's sulfur atom off to build cysteine, which can in turn be oxidized into taurine.^[25]

    

    A small dose suits methionine. Your requirement depends partly on cysteine intake, since dietary cysteine cut the methionine requirement by about 64% in one controlled study of men,^[26] and larger supplemental intakes raise homocysteine, with 1.5g per day bumping it by about 2µmol/L over four weeks.^[27] Steel Hydrate's 100mg is a fraction of that, and far below the 46.3mg/kg daily no-observed-adverse-effect level identified in healthy older adults (about 3.7g for an 80kg person).^[28]

  • L-Tryptophan - 100mg

    L-Tryptophan is the precursor to serotonin, melatonin, and one of the four niacin pathways.^[29] At 100mg, this is a profile-completing dose rather than a mood or sleep dose. For perspective, US adults already get about 826mg of tryptophan per day from food.^[30]

• Performance Hydration Matrix - 1,960mg

  The matrix handles the hydration half of the formula. The three minerals listed at the top of the label (50mg magnesium, 79mg sodium, and 60mg potassium) are the elemental amounts supplied by the magnesium glycinate, pink Himalayan salt, and potassium citrate below, so don't count them twice.

  • Taurine - 1,000mg

    Taurine is one of the most abundant amino acids in muscle tissue. It isn't built into proteins, and instead works as an osmolyte that helps regulate cell volume and calcium handling.^[31] That makes it a logical fit for a formula built around hydration and training.

    

    Its performance research supports a 1g dose. A 2025 meta-analysis of 23 randomized trials found that single doses of taurine produced small-to-moderate performance gains overall, led by aerobic endurance, strength and power, and agility, with no clear dose-response pattern across the commonly studied 1g to 6g range.^[32] So Steel Hydrate's 1g lands inside that range rather than below it.

    Taurine may help in the heat, too. In a crossover trial, 8 days of taurine at 50mg per kilogram of bodyweight (several times this dose for most people) increased sweating and boosted evaporative heat loss by 27% during low-intensity exercise in hot conditions.^[33] Research on taurine alone for recovery is more mixed,^[34] which makes its pairing with BCAAs (see the Ra study above) the more interesting angle for this formula.

  • Magnesium Glycinate - 354mg

    Magnesium glycinate is magnesium bound to the amino acid glycine, and this 354mg supplies the label's 50mg of elemental magnesium (12% DV). Magnesium is a cofactor in more than 300 enzymatic reactions, including the ATP-driven energy production and muscle contraction your training relies on,^[35] and research suggests magnesium needs climb as physical activity increases.^[36] At 12% DV, it's a useful top-up rather than a full magnesium dose, and the glycinate form adds a little bonus glycine.

  • Coconut Water Powder - 250mg

    

    Coconut water powder is dried coconut water, which is naturally high in potassium.^[37] Whole coconut water has performed comparably to commercial carbohydrate-electrolyte sports drinks for post-exercise rehydration in small crossover trials.^[38][39] Those studies used full beverage volumes, though, so the 250mg here is a natural-source contributor to the electrolyte base rather than a hydration dose on its own.

  • Pink Himalayan Salt - 200mg

    Pink Himalayan salt is mostly sodium chloride, and it supplies the label's 79mg of sodium (3% DV). Sodium matters for hydration because replacing the sodium lost in sweat is central to restoring fluid balance after exercise.^[40]

    For context, 79mg in 16oz to 20oz of water works out to roughly 6 to 7mmol of sodium per liter. A classic review notes that commercial sports drinks typically contain 10mmol/L to 25mmol/L, while optimal post-exercise rehydration may call for 50mmol/L to 90mmol/L.^[41] Sweat sodium losses also vary widely from person to person,^[42] so salty sweaters training long in the heat should plan on extra sodium from food or another source.

  • Potassium Citrate - 156mg

    Potassium citrate supplies the label's 60mg of potassium (1% DV). Potassium is the main electrolyte inside your cells, where the sodium-potassium pump maintains the gradient that muscle and nerve cells rely on, and most of what you lose leaves through urine rather than sweat.^[43] The small dose here simply rounds out the electrolyte profile, while your diet does the heavy lifting on potassium.

• AstraGin® (Astragalus membranaceus & Panax notoginseng) Root Extracts - 50mg

  

  One scoop for 150mg caffeine, two scoops for 300mg and the full label. SteelFit built Steel Fuel so your pre-workout scales with the session instead of locking you into one number. Stevia sweetened, naturally colored, fully disclosed.

  AstraGin is NuLiv Science's branded blend of Astragalus membranaceus and Panax notoginseng root extracts, and SteelFit includes it to support nutrient absorption. The most relevant human data is a 2026 randomized, double-blind crossover pilot that paired 50mg AstraGin capsules with whey protein. After four weeks of twice-daily doses alongside resistance training, absorption of valine and leucine rose 14.07% and 8.34% versus placebo, with the largest total-EAA effect (12.74%) in adults aged 60 to 80.^[44] We broke that study down in our AstraGin whey absorption article.

  For perspective, that trial tested whey, while Steel Hydrate delivers free-form amino acids that are already absorbed quickly,^[10] so AstraGin's added effect on this formula hasn't been measured directly. The four-week trial also reported no adverse effects on liver or kidney function at its 50mg doses.^[44]

• No Artificial Dyes: Blue Spirulina and Beet Root

  SteelFit markets Steel Hydrate as zero sugar with no artificial dyes, and the Other Ingredients back up the color claim. Blue Raspberry gets its color from blue spirulina, while Pink Lemonade uses beet root, and that's the only difference between the two flavors' ingredient lists.

Flavors Available

Steel Hydrate launches in Blue Raspberry and Pink Lemonade, both sugar-free and sweetened with stevia extract plus sucralose (no artificial dyes, but not stevia-only like Steel Fuel). SteelFit's five-point flavor scales rate Blue Raspberry 4 for sweet, 2 for tart, and 4 for fruity, while Pink Lemonade is equally sweet but more tart (3) and less fruity (2).

Here's an up-to-date list of all flavors of SteelFit Steel Hydrate:

How to Use

• When to take it: On training days, SteelFit recommends drinking a scoop during exercise, and on rest days, sipping it throughout the day.
• How to mix it: Mix one level scoop with 16oz to 20oz of cold water.
• Other notes: Don't exceed two servings per day. Steel Hydrate is caffeine-free, so it won't add to the stimulants in your pre-workout.

Stacks Well With

• SteelFit Steel Fuel: This is SteelFit's own suggested pairing: Steel Fuel before training for caffeine and pumps, then caffeine-free Steel Hydrate during the session. Together they deliver 2g of taurine, still inside the 1g to 6g range discussed above.
• SteelFit Creatine Monohydrate: SteelFit specifically recommends creatine monohydrate alongside Steel Hydrate, and every SteelFit creatine is made with Creapure®.

Who It's For

• Lifters and hybrid athletes who want one intra-workout scoop: If you've been mixing a BCAA product and a separate electrolyte drink, Steel Hydrate combines all nine EAAs, taurine, and a light electrolyte base in one caffeine-free scoop.
• The 30-and-up "Still Fit" crowd: SteelFit rebuilt its lineup for people who still train hard but have less time to do it, and a caffeine-free amino drink fits training days, workdays, and travel alike.
• Rest-day sippers: SteelFit designed Steel Hydrate for non-training days too, as a sugar-free way to keep amino acids and fluids coming between meals.

Conclusion: More Aminos Than the Name Suggests

SteelFit founder Rob Kaufman breaks down the new Steel Fuel pre-workout, Steel Hydrate, his HYROX training, and lessons from building Fungies on Episode #239 of the PricePlow Podcast.

The name Steel Hydrate almost undersells this one. Behind the hydration branding is 8.1g of essential amino acids per scoop, anchored by a 6g, 2:1:1 BCAA base with 3g of leucine and completed by the six EAAs the old Steel Fuel never had. SteelFit then adds 1g of taurine (which researchers have paired with BCAAs in recovery research), a coconut water and pink Himalayan salt electrolyte base, and AstraGin, all in a caffeine-free, sugar-free scoop with no artificial dyes.

It also slots neatly into SteelFit's relaunch next to Steel Fuel: pre-workout before training, Hydrate during it, and Hydrate again on rest days if you want the aminos. Just treat it as an amino-first drink with a light electrolyte base, so heavy sweaters in long, hot sessions should bring extra sodium.

If you want the full story behind SteelFit's comeback (and that twisted family tree), listen to Rob Kaufman on Episode #239. Then sign up for SteelFit news alerts on PricePlow and check the price comparison below for Steel Hydrate: