Frequently asked.

We offer a 30-day Money Back Guarantee on first orders. If your CARTERˣ order doesn't meet your standard, we'll refund it. No questions. Full policy available on our Shipping & Returns page.

Email returns@carterx.com with your order number. We'll respond within one business day with a prepaid return label and the return address.

Approved refunds are issued to your original payment method within 10 business days of us receiving your return. Banks and card issuers may take additional time to post the refund.

Original shipping charges are non-refundable. Return shipping is covered by us via prepaid label.

The CARTERˣ Promise applies to your first order only. Subsequent orders are not eligible for the guarantee, but we'll always make it right on damaged, defective, or incorrect items.

The CARTERˣ Promise applies to your first SYSTEMˣ shipment only. Subsequent shipments are not eligible for refund. You can pause, skip, or cancel a subscription anytime before your next billing date.

SYSTEMˣ is our subscription system. It bundles CARTERˣ products into three tiers (CORE, PRO, ELITE) at a discounted monthly rate, delivered on a recurring schedule.

• CORE: The foundation layer. Daily Hydration, Creatine, Omega-3, Multivitamin.
• PRO: CORE plus daily protein. Adds Whey Protein Isolate.
• ELITE: The complete range. PRO stack plus Pre-Workout and Hydration + BCAAs for training days.

SYSTEMˣ subscriptions deliver up to 50% off compared to one-time purchases. Discount applies automatically at checkout.

Yes, anytime. You have full control from your account dashboard. Add or remove products, modify upcoming shipments, skip a delivery, or cancel entirely.

Yes. Log into your account, go to "Manage Subscription," and choose "Skip Next Order." Your subscription resumes on the next scheduled cycle.

Your next shipment date is shown on your account dashboard. You'll also receive an email reminder 7 days before each charge.

Both can be updated from your account dashboard under "Subscriptions." Changes must be made before your next shipment is processed.

Add or swap products anytime from your account dashboard. Changes apply to your next shipment.

Yes. SYSTEMˣ subscriptions renew every 30 days. Cancel anytime from your account.

We'll notify you and either substitute another product (with your approval) or pause that line item until restocked. Your subscription will not be charged for missing items.

Start with the Foundation Four (Hydration, Creatine, Omega-3, Multivitamin). These are the daily essentials almost everyone benefits from. Add Whey Protein Isolate if you train regularly. Add Pre-Workout and Hydration + BCAAs if you train hard or do long sessions. Each product page has a full breakdown of who it's built for.

Each product page includes timing recommendations. As a general guide:

• Multivitamin, Omega-3: at night time after your last meal.
• Hydration, Creatine: anytime during the day, or before/during training.
• Whey Protein Isolate: first thing in the morning, within an hour of training, or between meals.
• Pre-Workout: 20 to 30 minutes before training.
• Hydration + BCAAs: during training sessions.

Yes. The range is built to stack. SYSTEMˣ tiers are designed around exactly this framework.

Tear open, pour into 26 ounces of water, shake, drink. Whey Protein Isolate and Pre-Workout work best with a shaker for full mixing.

Single-serve packs guarantee accurate dosing every time, eliminate scoop variance, travel well in any bag, and extend freshness compared to tubs. The format also means you're never carrying around an oversized container.

We recommend consulting your healthcare provider before starting any supplement during pregnancy or breastfeeding.

CARTERˣ products are formulated for adults 18 and older. Some products (Hydration, Multivitamin) may be appropriate for teen athletes under healthcare provider guidance.

Yes. All products are formulated for daily use at the dosages indicated on the label.

If you're taking prescription medications, particularly blood thinners, diabetes medication, thyroid medication, or any chronic prescription, consult your healthcare provider before starting any supplement.

Yes. Every ingredient is independently tested for purity, potency, and contaminants before production to ensure quality in every formula. Because of the number of ingredients in each formula it is uneconomical to test every ingredient again after production.

All CARTERˣ products are manufactured in the USA in FDA-registered, cGMP-certified facilities, using domestic and international ingredients.

NSF Certified for Sport certification is in progress. We'll announce as certifications complete. In the meantime, every ingredient is third-party tested and produced in cGMP-registered facilities.

Yes. All CARTERˣ formulas use non-GMO ingredients.

No. Every CARTERˣ product uses only natural flavors, natural colors, and natural sweeteners.

Our flavored products use stevia, a natural sweetener. Full ingredient lists are on every product page.

Branded ingredients are patented, standardized forms of supplement ingredients with their own clinical research. They cost more than generic alternatives but come with verified specifications and study-backed dosing. We use them where the science earns the cost. Full breakdown in our Branded Ingredients article.

Most supplement brands use sub-clinical doses (the "pixie dust" approach) so they can list ingredients on the label without committing to the cost of effective amounts. Every CARTERˣ formula is built at the dose used in the research that established the ingredient's effects. More on this in our Clinical Dose vs Pixie Dust article.

Yes. All CARTERˣ products are formulated without gluten.

Most products are dairy-free. Whey Protein Isolate is derived from dairy. The remaining range (Hydration, Creatine, Omega-3, Multivitamin, Pre-Workout, Hydration + BCAAs) is dairy-free.

Multivitamin, Creatine, Hydration, Pre-Workout, and Hydration + BCAAs are vegan. Omega-3 is sourced from fish oil. Whey Protein Isolate is derived from dairy.

No CARTERˣ formulas use soy.

Our manufacturing facilities follow strict allergen control protocols. If you have severe allergies, please review the full ingredient list on each product page, or email contact@carterx.com for specifics on any product.

Most products contain zero added sugar and minimal carbohydrates. Whey Protein Isolate fits comfortably in a keto framework at standard daily servings.

Hydration, Creatine, and Multivitamin can typically be taken during a fasted window without breaking a fast. Whey Protein Isolate and Omega-3 contain calories or amino acids that may break a strict fast. Check with your provider if you follow a specific fasting protocol.

A CARTERˣ account is created automatically when you place your first order. To sign in any time, visit /a/account. An account gives you order tracking, faster checkout, and access to manage any subscriptions.

Yes. Guest checkout is available.

Log into your account and visit the "Orders" section. All past orders, tracking, and invoices are stored there.

Contact us within 1 hour of placing your order at contact@carterx.com and we'll do our best to catch it before fulfillment. After 1 hour, orders enter the warehouse and may not be cancellable.

Yes. CARTERˣ gift cards are available from $25 to $500 and never expire.

Only one promotional code can be applied per order. Subscription discounts apply automatically and stack with most promotional codes.

Visa, Mastercard, American Express, Discover, Apple Pay, Google Pay, Shop Pay, and PayPal.

HSA/FSA eligibility is product-dependent and currently in review. We'll announce updates as certifications are completed.

One-time orders are charged at checkout. Subscriptions are charged on each shipment date, with an email reminder 3 days before charge.

Yes. We use Shopify's PCI-compliant payment processing. We do not store full card details on our servers.

We work with select gyms, performance facilities, and retailers. Contact wholesale@carterx.com for wholesale inquiries or see our wholesale page to apply.

Not yet, but we are considering it. Reach out to partnerships@carterx.com if you think you would be a good fit for the brand.

We work with a curated group of partners. Reach out to partnerships@carterx.com with your audience details and angle of interest.

• General inquiries: contact@carterx.com
• Returns and refunds: returns@carterx.com
• Wholesale: wholesale@carterx.com
• Partnerships: partnerships@carterx.com

We respond to all emails within one business day.

We currently handle all customer support via email. This lets us give thorough, accurate responses and keeps our overhead in formulation and ingredient quality rather than call centers. Every email gets a real human reply within one business day.

CARTERˣ is a US-based company.

Find us at @carterx on Instagram and TikTok.

CARTERˣ products are sold exclusively through carterx.com and approved partners. If you've purchased a CARTERˣ product elsewhere and have concerns about authenticity, email contact@carterx.com with photos and we'll verify.