Frequently Asked Questions

MCTs, or Medium-Chain Triglycerides, are fatty acids that contain between 6 - 12 carbon molecules. The MCT used in SFuels products is sourced from coconut oil. MCT is used because it is processed differently than LCTs (Long-Chain Triglycerides) found in foods. MCT is transferred directly to the liver where it can be used for energy.

Fat oxidation simply refers to the process of breaking down fatty acids. The intake of fat is the process of consumption, and the oxidation of fat is the end-use conversion into energy.

Keto is short for ketogenic and refers to a diet that is low in carbohydrates and higher in protein and fats. A ketogenic diet causes the body to break down fats into molecules called ketones.

Ketones are the molecules produced by your liver when your body is burning fat for energy.

Ketogenesis is a metabolic pathway that produces ketone bodies that are used as an alternative energy source for the body.

Glycogen sparing refers to the use of non-carbohydrates as a source of energy during exercise so that the depletion of muscle glycogen is delayed. If fat, for example, makes a greater contribution to an athlete's efforts during the initial stages of a race, more muscle glycogen will be available in the later stages, leading to delayed fatigue (The Oxford Dictionary of Sports Medicine and Science 3rd Edition, Micheal Kent).

Time to Exhaustion, or TTE, refers to the amount of time maximum effort can be sustained before fatigue occurs.

Rate of Perceived Exertion, or RPE, is a scale (usually from 1 to 10) where you rate the intensity of your exercise based on how hard you feel or perceive your effort to be.

Aerobic exercise is cardiovascular conditioning that strengthens your heart and lungs. Aerobic means "with oxygen," and aerobic exercise refers to types of exercise fueled by breathing. This type of activity includes repeated, continuous movement.

Anaerobic exercise is high-intensity exercise that is meant to be short and fast, for example, High-Intensity Interval Training (HIIT). During this exercise, your body doesn't use oxygen to keep your muscles going but rather accesses the energy already stored in your muscles.

SFuels ZONE 2, ZONE 4, and ZONE 5 Training and Racing Products are available for purchase in single sachets, making it easy to try before you buy. We also offer a money-back guarantee. If you are trying the product for the first time and you are unhappy with your purchase, reach out to us within 10 days of delivery, and SFuels will refund the cost of the product you ordered.

We accept Credit Cards, PayPal, Shop Pay, Google Pay, and Facebook Pay.

If your order is placed before 10:30 AM EST, it will be processed within 48 hours on weekdays. Orders placed after 10:30 AM will be processed the following business day. No order processing takes place on weekends or holidays. If your order is URGENT, please reach out to us at support@sfuelsgolonger.com to discuss available options.

Note: SFuels does not take responsibility for orders delivered to Hotels or Airbnbs after you have departed. Please contact your Hotel or Airbnb in advance to ensure they can accept and store your package.

We currently ship to a number of international destinations. Please note that taxes and charges for international orders are calculated by the courier and paid by the receiver directly to the courier.

SFuels has no control over these charges and will not accept responsibility for local taxes and duties. Orders cannot be canceled or returned based on international taxes and duties.

For orders over $75 USD shipped within the USA, we offer free shipping. If your country is not currently on our shipping list, please reach out to us at support@sfuelsgolonger.com.

Continental USA: Orders can be delivered between 3 and 10 days depending on the shipping method selected. If you qualify for free shipping, it can take between 7 - 10 days for delivery. Please allow extra time for delivery during major weather disruptions, labor disputes, or peak holiday times.

International (Standard/Express): DHL and UPS offer the most reliable and quickest delivery times. Allow at least 7 days for your order to be delivered, though this can be disrupted by weather, international incidents, or uncertain flight times.

International (Economy Couriers): Couriers like Flat Export, Asendia, RRD, etc., offer cheaper shipping options by using local mail services within the US and the destination country. Please be aware that this service is slow—it can take 6 - 12 weeks depending on customs clearance, and there is very little tracking available. If your order is urgent, we highly recommend using DHL or UPS.

Yes. All countries assess imports for local taxes and duties at a rate determined by the receiving country.

All taxes and duties are payable by you directly to the courier; SFuels will not be liable for these charges. For International Shipping, please include your phone number so the courier can contact you for payment. Note that some couriers also charge a handling fee.

We hope you don't change your mind, but you can cancel any order by emailing us at support@sfuelsgolonger.com within 1 hour of placing your order.

If your product was damaged during shipment, please let us know! Email us at support@sfuelsgolonger.com and we’ll sort things out.

Your first point of contact should be your chosen courier. SFuels is happy to help, but we can only provide you with the same information you see on your tracking details. If your order is marked delivered and you cannot find it, we suggest checking with your neighbors and your local post office or UPS office. Sometimes a parcel is marked delivered before physical delivery, so please wait up to 24 hours before reaching out. If this doesn't resolve the issue, contact us at support@sfuelsgolonger.com.

Depending on the destination, deliveries by economy couriers can take upwards of 8 weeks. They partner with the local postal service in both the USA and the destination country to lower costs. Parcels are taken by USPS, sent to an international consolidation center in the USA, combined with other parcels, and sent to your country. Customs clearance can delay the hand-off to your local postal service.

Economy courier services send parcels to an international consolidation center in the USA before forwarding them to your country. When the parcel arrives at this US-based consolidation center, it is marked as "delivered." Once it leaves the center, tracking is very limited, and it can be weeks before we know where your parcel is.

Yes! We guarantee you will love our products. If you don’t, please reach out to us at support@sfuelsgolonger.com, and we will organize a refund for your purchase. If you have unopened products, we will provide a return shipping label.

If for any reason SFuels isn’t a crowd-pleaser, we’re here to make things right. The easiest way to start a return is by contacting us at support@sfuelsgolonger.com.

Yes, we do offer wholesale pricing depending on the quantity and frequency of orders placed. Please contact us at support@sfuelsgolonger.com if you would like to learn more.

We do not sell gift cards at present. Let us know if this is something you would be interested in by contacting us at support@sfuelsgolonger.com.

Please contact us at support@sfuelsgolonger.com.