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Certified Nutrition & Supplement Expert · Long Island, NY

Most People Selling You Supplements
Don't Know What's In Them.
John Does.

John Mavros is a certified nutrition and supplement expert. Not a retail clerk who read the label. Not a gym bro with a promo code. Someone who has studied formulations, understands ingredients, knows which products actually deliver on what they claim — and will tell you straight when something isn't worth your money.

Whether you need a personal supplement stack built around your actual goals, or you're a gym owner looking to add a branded supplement line as a revenue stream — you're talking to the right person. And he ships nationwide.

Certified Nutrition Expert Certified Supplement Expert cGMP-Certified Products Ships Nationwide Private Label for Gyms

iBuildGyms · Founder

John Mavros

Certified Nutrition & Supplement Expert

Certified Nutrition Expert

Certified Supplement Expert

Gym Design & Equipment Expert

Serving Nassau & Suffolk County, NY

Ships Nationwide · FL & NY Distribution

🧪 The supplement industry is full of products that are 90% maltodextrin and marketing. John knows which ones those are. He's not going to recommend them to you just because the margin is better.

100+

Products Available

cGMP

Certified Manufacturing

1–2 Day

Shipping · NY & FL

Private

Label Available for Gyms

What John Carries

Four Categories.
Everything Formulated to Actually Work.

Every product John recommends is something he'd take himself — or has. cGMP-certified manufacturing, third-party tested, no fillers, no mystery blends where the good stuff is dosed too low to matter.

Recovery & Muscle

Protein Supplements

Protein is the one supplement category where the difference between a good product and a bad one is enormous — and almost impossible to see from the label alone. John knows which whey isolates are actually hitting 25g of protein per scoop versus which ones are padding the numbers with amino spiking. If you're buying protein, ask him first. You'll save money and you'll stop tasting chalk.

Whey Isolate & Concentrate

Plant-Based Options

Meal Replacement Formulas

Protein Bars & RTDs

🥛 Amino spiking is when a company inflates the protein count using cheap amino acids that don't build muscle. It's legal and common. John doesn't carry those.

Ask John About Protein

Energy & Output

Performance & Pre-Workout

The pre-workout category has more garbage products per square inch than almost anything else in the supplement industry. Underdosed caffeine, prop blends hiding 200mg of "proprietary matrix" that's mostly filler, and enough artificial dye to color a swimming pool. John recommends pre-workouts where you can read every ingredient, every dose, and understand what each one actually does.

Pre-Workout Formulas

BCAAs & EAAs

Creatine Products

Energy & Focus Enhancers

Creatine monohydrate is one of the most studied supplements in existence. It works. It's cheap. Anyone selling you a "superior creatine" at 4× the price is mostly selling you marketing.

Ask John About Performance

Foundations

Health & Wellness

The supplements most people skip because they're not sexy — vitamins, omegas, joint support — are often the ones doing the most work long-term. If you're training hard and not covering your foundational nutrition, you're building on a shaky base. John treats health and wellness supplements as non-negotiable infrastructure, not an afterthought. Everything else performs better when this category is covered.

Multivitamins

Omega-3 Supplements

Joint Support Formulas

Immune Support Products

🐟 Most people are deficient in Vitamin D and Omega-3s without knowing it. Neither of them are exciting to talk about. Both of them matter more than your pre-workout.

Ask John About Wellness

Post-Workout

Recovery Products

The training session tears muscle down. Recovery is where it actually gets built. If you're not recovering properly — sleep, nutrition, the right supplements — you're working hard in the gym and leaving results on the table. John also connects directly with the iOX Performance & Recovery team for clients who need deeper recovery work beyond supplementation. The whole ecosystem talks to each other.

Post-Workout Formulas

Sleep & Recovery Aids

Glutamine Supplements

Anti-Inflammatory Blends

Need recovery beyond supplements? John connects clients with iOX Performance & Recovery — the full recovery ecosystem.

Ask John About Recovery

Every product John recommends is manufactured in an FDA-registered, cGMP-certified facility and third-party tested for purity and potency. No proprietary blends hiding underdosed ingredients. No label claims that don't hold up. If John doesn't trust it, he doesn't sell it.

Get My Stack

For Gym Owners

Your Members Are Already
Buying Supplements Somewhere.
That Money Could Stay in Your Gym.

John builds supplement programs for commercial gyms, training studios, and fitness centers across Nassau County, Suffolk County, and the full NY Tri-State area. Private label, bulk ordering, retail display, auto-replenishment — the whole program. You focus on running your gym. John handles the supply chain.

💰 A member who buys their protein, pre-workout, and recovery stack from your gym front desk every month is worth an extra $80–$150/month on top of their membership. Most gym owners are leaving that on the table because they don't have a system. John builds the system.

12+

Units Min Order

3–4 wk

Private Label Turnaround

Auto

Replenishment Available

Ready to build your supplement program?

Tell John your facility size, member count, and what categories you'd want to carry. He'll come back with a program that makes sense for your numbers.

Request Wholesale Info

Private Labeling

Your gym's logo, your branding, your colors — on a product line that looks like you built it from scratch. Private label supplements create a brand identity that keeps members buying from you instead of Amazon. Typical turnaround is 3–4 weeks from design approval. Rush options available if you're working to a specific launch date.

Full design support included

Bulk Ordering & Wholesale Pricing

Significant price breaks on wholesale orders with flexible minimums. Most products start at 12 units — workable for a boutique studio and scalable for a large commercial facility. The more you move, the better the margin. John structures the order volume around what your membership count can realistically sell, not an arbitrary minimum that leaves you with 60 tubs of protein gathering dust behind the desk.

Minimums scale to your facility size

Retail Display Solutions

A supplement program without a proper display is just a shelf of random tubs that nobody notices. Professional display racks, signage, and point-of-sale materials are part of the program — designed to catch attention at the front desk or check-in area, where the impulse buy happens naturally. John sets up the physical environment the same way he'd design a gym floor: intentionally, with traffic flow in mind.

Display racks + signage provided

Auto-Replenishment

Running out of your top-selling product on a busy Monday morning is a bad experience for your members and a lost sale for you. Auto-replenishment programs set regular shipments from Florida or NY distribution centers so your display stays stocked without you manually reordering every few weeks. The system runs in the background. You don't think about it. It just works.

Ships from FL or NY on your schedule

Dropshipping for Trainers

Personal trainers and online fitness businesses can sell products without holding inventory. You recommend, client orders, fulfillment ships directly from Florida or NY distribution. You keep the margin. John handles the backend. Contact him for eligibility and program details.

Ask About Dropshipping

Custom Formulations

For larger-volume orders, John can work with you to develop custom formulations built to your specific requirements — unique blends, branded macros, proprietary stacks. Not available at 12-unit minimums, but if you're running a 500+ member facility and want something nobody else has on their shelf, this is the conversation to have.

Ask About Custom Formulas

For Individuals

Stop Buying Whatever
the Influencer Is Pushing This Week.
Talk to Someone Who Actually Knows.

John gives individuals the same expertise he gives commercial gym clients. You tell him your goals, your training, your diet, and what you're currently taking. He tells you what's working, what's wasted money, and what you're actually missing. Then he gets it shipped to you.

Personalized Recommendations

The generic "beginner stack" on every supplement website is designed to sell you five products regardless of whether you need five products. John asks what your actual goals are — fat loss, muscle gain, endurance, general health, specific deficiencies — and builds a recommendation around that. Sometimes the answer is three things. Sometimes it's one. He's not going to pad the list.

🎯 The most common result of John's first conversation with a new client: they realize they've been taking two things that cancel each other out and skipping the one thing that would actually help.

Online Ordering + Nationwide Shipping

You don't have to be in Nassau County or on Long Island to work with John. He ships nationwide. NY Tri-State and Southern Florida get 1–2 day shipping from the nearest distribution point. Everywhere else is 2–5 business days. Order through the contact form, John confirms your recommendation, product ships. That's the whole process.

1–2 Day · NY & FL 2–5 Day · Nationwide Expedited Options Available

Subscription Savings

If you're taking the same products every month — and if John built your stack right, you will be — subscription pricing gets you a better rate than single orders and automated delivery from FL or NY distribution so you never run out mid-cycle. Consistency is where supplementation actually works. A subscription makes consistency automatic.

Auto-delivery · Better pricing · Cancel anytime

Quality Guarantee — No Exceptions

Every product John recommends is manufactured in an FDA-registered, cGMP-certified facility and third-party tested. Satisfaction guaranteed — if something isn't right, John makes it right. This isn't a disclaimered guarantee buried in fine print. It's the way John operates across everything he does: gym design, equipment, moving, and nutrition. The same standard applies here.

FDA-registered · cGMP-certified · Third-party tested

How It Works

Three steps. No guesswork.

Tell John your goals

Training style, diet, current supplements, what you're trying to achieve. 10 minutes or a quick form fill.

John builds your stack

Personalized. Specific. Explained. He tells you what each thing does and why it's in your stack — not just a product list.

It ships to your door

cGMP-certified products, your shipping speed, subscription option if you want it. Done.

Get My Recommendations

📱 Not local to Long Island? John does 15-minute video calls for supplement consultations. Same expertise, no drive. Book through the contact form.

John's recommendations are based on what works, not what pays the best commission. If the answer to your situation is "you honestly don't need a supplement right now — fix the diet first," he'll say that. It's not the most profitable answer. It's the right one. That's the difference between a certified expert and a supplement store employee with a sales target.

Start With John

Shipping & Distribution

Two Distribution Points.
Ships Fast to Most of the Country.

Florida headquarters covers the Southeast. NY Tri-State operations cover the Northeast. Between the two, most of the country gets fast shipping. The rest still gets nationwide delivery within 2–5 business days. Wherever you are, the supply chain is already closer than you think.

Primary HQ

Florida Headquarters

1–2 Day · FL

Main distribution center and quality control headquarters. Serves the southeastern United States with expedited shipping to Southern Florida — Miami-Dade, Broward, Palm Beach, and surrounding counties get next-day or 2-day delivery as standard. Nationwide orders also ship from here when it's the closest point.

Miami-Dade Broward Palm Beach Southeast US

Home Base

NY Tri-State Operations

1–2 Day · NY/NJ/CT

John's home territory. Nassau County, Suffolk County, all five NYC boroughs, Northern New Jersey, and Connecticut get 1–2 day shipping from the NY operations. Local commercial clients in the Tri-State area can also arrange local pickup. If you're on Long Island, this is the distribution point supplying your order.

Nassau County ★ Suffolk County ★ NYC NJ CT

Everywhere Else

Nationwide Shipping

2–5 Day · Nationwide

Outside FL and NY Tri-State, orders ship from whichever distribution point gets it to you fastest. Standard nationwide delivery is 2–5 business days. Expedited options available at checkout for anyone who needs it sooner. Competitive shipping rates — this isn't a "we charge $25 shipping on a tub of protein" operation.

All 50 States Expedited Available Competitive Rates

1–2 Days

NY Tri-State & Southern FL

2–5 Days

Nationwide Standard

Expedited

Available at Checkout · All Locations

On a subscription? Your order ships automatically from the distribution point closest to you on your chosen schedule. You don't reorder. You don't track it. It shows up at your door when it's supposed to. That's what a well-run supply chain feels like.

Set Up Subscription

Questions John Gets Every Week

Straight Answers.
No Upsell. No Fine Print.

These are the questions John hears most before someone places their first order or sets up a gym program. Answered the way he'd answer them in person — which is to say, directly.

How quickly can I receive supplements in the NY Tri-State area?

NY Tri-State orders ship from the NY operations and typically arrive within 1–2 business days. Southern Florida orders ship from the Florida headquarters on the same 1–2 day window. If you're in Nassau or Suffolk County and ordering before noon on a weekday, there's a good chance it arrives the next morning. Nationwide is 2–5 business days depending on where you are relative to both distribution points.

💡 Expedited shipping is available everywhere if you need it faster than standard.

What are the minimum order quantities for gym bulk orders?

Most products start at 12 units for standard bulk orders. Custom-branded products have slightly higher minimums depending on the formulation and packaging involved. John works backward from your facility size and membership count — he's not going to put you in a position where you're sitting on 6 months of unsold inventory because the minimum was unrealistic for your volume. If you run a 50-person boutique studio, the program looks different than a 500-member commercial gym. Both are serviceable.

💡 Tell John your member count upfront. It changes everything about the order structure.

Do you offer private label supplements for gyms?

Yes. Custom-branded supplements with your gym's logo, colors, and branding — on products manufactured in the same FDA-registered, cGMP-certified facilities as everything else John carries. Typical turnaround is 3–4 weeks from design approval, and full design support is included. Rush options can shorten that to roughly 2 weeks if you're working toward a specific launch date. The end product looks like you built a supplement company, because functionally, you did.

💡 Private label creates a revenue stream and a brand touchpoint your members carry out the door every day.

Where are the supplements manufactured?

Every product is manufactured in FDA-registered, cGMP-certified facilities in the United States. Quality control is overseen from the Florida headquarters. Third-party testing is standard across the entire product line — not selective, not done on some products but not others. If something doesn't pass, it doesn't ship. That's the non-negotiable part of how John runs this.

💡 Made in the USA. Third-party tested. No asterisks.

Can John provide personalized supplement recommendations?

That's the whole point of working with someone certified in nutrition and supplementation instead of walking into a GNC. John asks about your goals, your training frequency, your diet, and what you're currently taking — then builds a recommendation specific to you. Not a generic beginner stack. Not whatever has the best margin this month. If you're on Long Island, he can do this in person on a consultation visit. If you're anywhere else, a 15-minute video call covers the same ground.

💡 The consultation is free. The recommendation is honest. The product ships the same day it's confirmed.

Do you offer dropshipping for trainers or fitness businesses?

Yes. Qualified fitness professionals and online fitness businesses can sell products without holding any inventory. You recommend the product to your client, they order, fulfillment ships directly from the Florida or NY distribution centers under your brand or the product brand depending on the program structure. You keep the margin. You never touch a box. Contact John for eligibility details — the program isn't open to everyone, but if you're a working trainer with an active client base, the conversation is worth having.

💡 You recommend. They order. It ships. You earn. John handles the supply chain.

Question not covered here?

John answers supplement questions directly — no contact form auto-responder, no FAQ chatbot. Message him or call him. If it's a quick question, he'll give you a quick answer. If it needs a real conversation, he'll set up the 15-minute call and go from there.

Nassau & Suffolk County · Long Island, NY · Ships Nationwide

There Are a Thousand Places
to Buy Supplements Online.
Only One of Them Is a Certified Expert
Who Also Designs Your Gym.

John doesn't sell supplements because it's a good margin. He sells them because it's the last piece of the gym ecosystem that most people get wrong — and because a well-designed gym with the right equipment means nothing if the person training in it is running on a stack of underdosed mystery powder.

"I'm certified in nutrition and supplementation because I got tired of watching people train their hardest and wonder why they weren't getting results — and finding out later they were spending $150 a month on products that didn't do what the label said. I'm not here to sell you everything. I'm here to tell you what actually works."

John Mavros

Founder, iBuildGyms · Certified Nutrition & Supplement Expert

Start Here

John Mavros

Certified nutrition and supplement expert. Gym design. Equipment sourcing. 3D layout. The whole operation runs through one conversation with him.

ibuildgyms.com

New Equipment + Service

Gym Tech Fitness

New commercial equipment sourcing and ongoing service and repair. The machines that house your supplement-fueled workouts — sourced, serviced, and maintained through John's network.

gymtechfitness.com

Pre-Owned · 30–70% Off

PreOwnedGym.com

Pre-owned commercial equipment sourced and vetted by John. Budget freed up by buying smart on equipment is budget available for a proper supplement program.

preownedgym.com

Moving & Installation

FitMovers123

John's dedicated moving and installation partner. Equipment sourced through John arrives installed and tested — not sitting in a box in your parking lot waiting for someone to figure it out.

fitmovers123.com

Reach John Directly

John Mavros

Founder · iBuildGyms · Certified Nutrition & Supplement Expert · Long Island, NY

Phone

954-234-4393

Email

john@ibuildgyms.com

Hours

Mon–Fri, 9 AM – 5 PM

In-Person Area

Nassau & Suffolk County · Full NY Tri-State

Shipping

Nationwide · FL & NY Distribution

📱 Not local? John does 15-minute video call supplement consults. Same expertise, no drive. Book through the contact form.

🔬 All products: FDA-registered · cGMP-certified · Third-party tested · Made in the USA.

What Happens When You Reach Out

You tell John what you need.
He tells you what actually works.

Individual or gym program — same process. Tell John your situation. He builds a recommendation. It ships. If it's a gym wholesale inquiry, he structures an order program that fits your volume and gets the display set up. Either way it starts with one message.

Message or call John

Goals, training, current supplements, gym size — whatever applies. 2 minutes to type, 15 minutes on a call if you prefer.

John builds your recommendation

Personalized stack or gym program. Every product explained. No padding, no filler recommendations, no upsell for its own sake.

It ships. You're done.

cGMP-certified products, fast shipping from FL or NY, subscription option if you want ongoing auto-delivery. That's the whole system.