Protocol·Weight Management·Beginner·Reviewed June 9, 2026
Intermittent Fasting Support Protocol.
A beginner-friendly stack built to ease the common friction points of intermittent fasting: electrolyte loss during longer fasting windows and the body's gradual shift toward using fat for fuel. Supplements here are supportive only and do not replace adequate water, food quality during eating windows, or medical guidance.
The intermittent fasting support protocol in brief.
A quick summary. The full stack, with dose and timing for each supplement, is below.
The Intermittent Fasting Support Protocol is a beginner stack of 5 supplements aimed at weight management: Magnesium Glycinate, Potassium, MCT Oil, L-Carnitine, and Green Tea Extract. 2 are core and the rest are optional add-ons, at roughly $25-45/mo. Each supplement below lists its dose, timing, role, and the evidence behind it.
What is in the intermittent fasting support protocol.
Dose, timing, role, and evidence tier for each supplement. Core items carry the protocol; optional ones are situational. Open any name for the full profile.
| Supplement | Dose | Timing | Role | Evidence |
|---|---|---|---|---|
| Magnesium Glycinate | 200-400 mg elemental magnesium per day | With your last meal, ideally in the evening; it can be taken during the fasting window since it adds negligible calories | Core | Moderate |
| Potassium | 200-400 mg supplemental potassium per serving, up to roughly 1,000 mg per day from supplements, alongside potassium-rich foods in eating windows | Spread across the fasting window, sipped in water rather than taken all at once | Core | Moderate |
| MCT Oil | 5-15 g (about 1 to 3 teaspoons), starting low to assess tolerance | Within the eating window, or as part of a deliberate fat-fast approach; note that MCT Oil adds calories and breaks a strict water fast | Optional | Emerging |
| L-Carnitine | 1,000-2,000 mg per day | With a meal in the eating window, since absorption may improve with food and it adds calories | Optional | Emerging |
| Green Tea Extract | Standardized extract providing roughly 200-300 mg EGCG per day, kept well below 800 mg EGCG daily | With food in the eating window to lower the risk of liver stress and stomach upset; a decaffeinated form is preferable if taken later in the day | Optional | Emerging |
Magnesium can be lost more readily during carbohydrate restriction as insulin falls and the kidneys excrete more, so replacing it may help with cramps, restlessness, and poor sleep in people who are running low. The glycinate form is generally well tolerated and tends to be gentler on the stomach than oxide.
As insulin drops during a fast the kidneys tend to shed more sodium and potassium, and modest replacement may help with the fatigue, lightheadedness, and muscle weakness sometimes felt on longer fasts. Keep single doses small and do not supplement potassium if you have kidney disease or take ACE inhibitors, ARBs, or potassium-sparing diuretics, because of hyperkalemia risk.
Medium chain triglycerides are absorbed largely via the portal vein and are rapidly oxidized, modestly raising blood ketones, which some people find supports satiety and steadier energy as they adapt to using fat for fuel. Start small because larger single doses commonly cause cramping and loose stools, and use caution in significant liver disease.
L-Carnitine helps shuttle long chain fatty acids into the mitochondria where they are burned for energy, so supplementation may modestly support fat oxidation, most plausibly in people with lower baseline levels. Evidence for added benefit in well-nourished people is mixed, and there is limited evidence it could blunt thyroid hormone action, so use caution if you have hypothyroidism.
Catechins such as EGCG, together with any caffeine present, may give a small boost to fat oxidation and energy expenditure that could complement a fasting routine, though effects are modest and inconsistent. Take it with food rather than on an empty stomach, keep the dose modest, and avoid it in liver disease, since concentrated extracts have rarely been linked to liver injury, with risk rising toward and above 800 mg EGCG per day.
How the pieces combine.
The mechanistic rationale for stacking these together rather than taking them in isolation.
- Magnesium Glycinate and Potassium together address the two electrolytes most easily depleted during a fast; sip them in water across the fasting window rather than dosing both at once, which is gentler on the stomach and steadier for hydration. Both add negligible calories, so they fit a water fast.
- Keep Magnesium Glycinate and Potassium dosing modest and food-supported on days you also use diuretics or sweat heavily, and stop supplemental Potassium entirely if you have kidney disease or take ACE inhibitors, ARBs, or potassium-sparing diuretics.
- MCT Oil and L-Carnitine are complementary on the fat-oxidation side: MCT Oil provides a quick, ketone-friendly fuel and L-Carnitine supports transport of fatty acids into the mitochondria. Note that both of these (and any caloric item) technically break a strict fast, so they suit your eating window or a deliberate fat-fasting approach rather than a strict water fast.
- Green Tea Extract and L-Carnitine can be paired in the eating window to support fat metabolism, but take Green Tea Extract at least 2 hours apart from any iron supplement or iron-rich meal, since its catechins can reduce iron absorption.
- Stack any caffeine-containing Green Tea Extract earlier in the day and well separated from your evening Magnesium Glycinate dose, so the stimulant effect does not undercut the sleep and relaxation benefit of magnesium.
Cost and commitment.
A rough monthly cost and how involved the protocol is to run.
The evidence behind it.
Overview citations for this protocol. Each supplement's own profile carries its full source list.
- Patterson RE et al. Metabolic Effects of Intermittent Fasting. Annu Rev Nutr. 2017;37:371-393. PubMed
- de Cabo R et al. Effects of Intermittent Fasting on Health, Aging, and Disease. N Engl J Med. 2019;381(26):2541-2551. PubMed
- Sterns RH. Disorders of plasma sodium--causes, consequences, and correction. N Engl J Med. 2015;372(1):55-65. PubMed
Common questions.
Quick answers drawn from the stack above.
What is in the Intermittent Fasting Support Protocol?
The Intermittent Fasting Support Protocol combines 5 supplements for weight management: Magnesium Glycinate, Potassium, MCT Oil, L-Carnitine, and Green Tea Extract. 2 are core; the rest are optional.
How much does the Intermittent Fasting Support Protocol cost?
NutriStack estimates the Intermittent Fasting Support Protocol at about $25-45/mo, depending on the forms and brands you choose and whether you run the optional add-ons.
Is the Intermittent Fasting Support Protocol backed by evidence?
Each supplement in the protocol carries its own evidence tier (0 rated strong here) and links to PubMed-cited sources. NutriStack does not rank or score brands and takes no manufacturer payments; this is an informational reference, not medical advice.
Build it in the app
Run the intermittent fasting support protocol in NutriStack.
Add the stack to NutriStack to track timing, screen it for interactions, and see a Stack Score that updates as you tune it.