We made the protein we couldn't find.

Mainstay started with a half-empty tub in the back of a cupboard — and a simple question nobody selling protein seemed to be asking.

Mainstay didn't start in a lab or a boardroom. It started with me standing in an airport, unable to lift my own carry-on into the overhead bin.

I'd lost nearly forty pounds on a GLP-1. It worked better than fifteen years of dieting ever had, and I'd do it again tomorrow. But somewhere around month five, I realised I was losing something I hadn't agreed to lose: my strength. My arms looked empty. My energy was gone. I didn't recognise myself.

When I went looking for why, I found the same two-line answer everywhere — get enough protein, and protect your muscle. Simple. Except the medication had taken my appetite, and every protein on the shelf was a thick, sweet, milky shake built for someone who was hungry. I wasn't. I'd take two sips and give up. My expensive tub sat three-quarters full in the cupboard for months.

The problem was never the protein. It was finishing it.

That was the realisation Mainstay is built on. When your appetite disappears, the number on the tub stops mattering — the only protein that counts is the protein you actually drink. So I stopped looking for the most protein and started looking for the one I could finish on my worst day, not my best one.

It didn't exist. So I made it.

Mainstay

What we built

Clear protein, not a shake. Mainstay mixes into cold water and comes out like a light, tart juice — nothing creamy, nothing that sits in your stomach like cement. Small enough to finish on the day after your shot. Complete protein, plus the collagen, fibre and electrolytes that are the other half of the conversation nobody has with you.

And because protein alone isn't the whole story, we pair it with creatine — the most-studied strength ingredient there is — as a simple daily gummy. Two easy habits that work together. We call it the Mainstay Protocol, because that's what it is: not a miracle, just the two things that actually help, made easy enough to keep doing.

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What we believe

A few things we won’t compromise on.

Completion over numbers

A serving you finish beats one that impresses you. We’d rather give you something you’ll actually drink than a bigger number you leave behind.

Honest, not hyped

We don’t do miracle claims, fake countdowns or before-and-after photos. We’ll tell you what our product does and, just as clearly, what it doesn’t.

Easy to leave

No subscription traps. Cancel in one click, with no phone call and no retention agent. If it’s not for you, you shouldn’t have to fight us to go.

Mainstay standards

How it’s made

We take what goes into your body seriously — especially when your appetite, routine and tolerance may already feel different.

cGMP Certified

Produced in a cGMP-certified facility under strict quality and safety standards.

Third-party tested

Every batch is independently tested for identity, purity and potency — not simply taken on our word.

Made in considered batches

Blended in carefully managed runs so each bag arrives fresh, consistent and ready to become part of your routine.

Nothing there for show

No added sugar, artificial colours or unnecessary fillers — only ingredients that earn their place in the glass.

Mainstay was created for the part of the GLP-1 journey that rarely gets discussed: when the weight is moving, but eating enough and protecting your strength feels harder than expected. It’s the kind of support we needed and couldn’t find. Now it’s here.

SUPPORT & RESOURCE

Our dedicated customer support team is here to help you with any questions or issues you may have.

Explore our comprehensive support and resources section designed to assist you with all your needs. From detailed guides and FAQs to live chat support and community forums, we're here to help you make the most of your experience.
Whether you have a question about our products or need technical assistance, find everything you need right here.

How do I sign up for a subscription plan?

Signing up is easy! Simply visit our subscription page, choose the plan that best suits your needs, and follow the prompts to complete your registration.

How do I place an order on your online store?

To place an order, browse our products, add your desired items to the cart, and proceed to checkout. Follow the on-screen instructions to complete your purchase.

What is your return policy?

We offer a 30-day return policy on most items. If you are not satisfied with your purchase, please contact our customer support team to initiate a return. Items must be returned in their original condition.

How do I apply a discount code to my order?

During checkout, enter your discount code in the designated field and click "Apply." The discount will be applied to your order total.

Do you offer international shipping?

Yes, we offer international shipping to select countries. Shipping rates and delivery times vary based on the destination. Please refer to our shipping policy for more details.