Rapid electrolyte repletion for fasting, keto, and athletic recovery.

Three capsules daily deliver 300mg potassium, magnesium, and sodium chloride in a balanced ratio. No sugars, no artificial sweeteners—just essential minerals for cellular energy, muscle function, and nerve signalling. Designed for those managing low-carb diets or intense physical exertion.

Why This Formula

✔ Potassium 300mg—addresses the primary electrolyte deficit in fasting and keto ✔ Magnesium citrate (buffered)—highly absorbable, supports muscle and nerve function ✔ Sodium chloride—maintains osmotic balance without excess ✔ Zero sugars, zero artificial sweeteners—compatible with any diet protocol ✔ Convenient capsule format—no mixing required

Who It's For

Intermittent fasters, ketogenic dieters, endurance athletes, and anyone experiencing fatigue or muscle cramps during low-carb phases or intense training.

The xSpan Labs Standard

Small-batch manufactured in the UK to GMP and ISO 9001 standards. No unnecessary fillers, no artificial colours, no inflated marketing—just premium-grade ingredients in their most effective forms. Every batch is tested for purity and potency.

Fasting Electrolytes - 120 Capsules - Advanced Rapid Rehydration Formula

Name: Fasting Electrolytes - 120 Capsules - Advanced Rapid Rehydration Formula
Brand: xSpan Labs
SKU: CF-149-FastElec
Price: 10.97 GBP
Availability: InStock
Rating: 4.7 (7 reviews)

Rating is 4.7 out of five stars based on 7 reviews

SKU: CF-149-FastElec

£13.99

£10.97

Quantity

Directions
Adults, take 3 capsules per day with a large glass of water. Do not exceed recommended dose.

Ingredients
Sodium Chloride, Potassium Chloride, Capsule Shell: Hydroxypropyl Methylcellulose, Magnesium Citrate (Buffered), Anti-Caking Agents (Magnesium Stearate, Silicon Dioxide).

Cautions
Always consult your health practitioner before taking nutritional supplements, especially if you are taking medication or are under medical supervision. Not recommended for children, pregnant or lactating women. You should not take supplements as a substitute for a varied balanced diet or healthy lifestyle. Store in a cool, dry & dark place, under 25 degrees, out of reach of children. Allergy advice: although rigorous precautions are taken to prevent any cross-contamination, this product is manufactured in a facility that handles allergy-based materials.

Allergies/Intolerances: this product is free from all common allergens, including gluten, wheat, dairy, eggs, fish, crustaceans, molluscs, soy, sesame, celery, mustard. Although rigorous precautions are taken to prevent any cross-contamination, this product is manufactured in a facility that also handles allergy-based materials such as nuts, seeds, milk, egg, cereals, soya, mustard, celery, fish, crustaceans and sulphites.

Suitable for Vegetarians and Vegans
xSpan Fasting Electrolytes - 120 Capsules - Advanced Formula with a balanced Magnesium, Sodium, Potassium & Chloride blend - suitable for Ketogenic Diets - Vegetarian & Vegan friendly – made in the UK:
trace minerals to energise your cells
acts fast and helps relieve unpleasant common side effects of dehydration
helps relieve cramps
provided in a convenient 3 capsule dose without any sugar or artificial sweeteners
xSpan Labs Guarantees High Quality products are manufactured exclusively in the UK to GMP code of practice and ISO 9001, using only the finest quality raw materials in their highest grade and purest form so you receive a consistently high-quality product

Our formulation is free from: ✘lactose, ✘gluten, ✘wheat, ✘soya, ✘yeast, ✘dairy, ✘GMOs.

Suitable for both Vegetarians and Vegans

Reviews

Rated 4.7 out of 5 stars.

4.7 | 7 reviews

7 reviews

N.ThomasApr 28, 2023
Rated 5 out of 5 stars.
Great value fasting electrolytes.
Amazon Vine Customer Review of Free Product. This product arrived fast and is as described on the seller page. It costs 9.97 I got this product to try out because I need something reliable to help me keep electrolytes balanced. I have found this product useful. They appear as a transparent capsule filled with white powder. All in all, I like these. No problems with them. They are great value for money.
SteveJan 22, 2023
Rated 5 out of 5 stars.
Ideal
of Free Product ( [What's this?](https://www.amazon.co.uk/gp/vine/help/ref=cm_cr_dp_d) ) I’ve always fasted regularly during the day with a main meal in the evening. These capsules are ide… For me, I’ll take one in the morning and one at lunchtime before a meal in the evening, to support …
Nicola KSJun 07, 2023
Rated 5 out of 5 stars.
Important To Take Whether You Diet or Not
I assumed they worked as I started earlier in this year trying fasting about 3 times a week before eating.
Graham DruryFeb 11
Rated 4 out of 5 stars.
No complaints.
These electrolytes seem a good bet for fasting. Sugar & sweetener free and vegetarian/vegan friendly!
brian harkerAug 20, 2024
Rated 4 out of 5 stars.
just what,s needed
Seemed to provide a little kick after starting to use them

Fasting Electrolytes - 120 Capsules - Advanced Rapid Rehydration Formula

Supplement Facts

Background

Reviews