The supplement industry has trained athletes to think about stacking in terms of performance output: pre-workouts, protein, creatine, beta-alanine. These all have their place. But there's a category of stacking that rarely gets discussed — and arguably matters more for long-term athletic capacity than any of them.
Internal support. Specifically, the organs that make sustained high-performance training possible: your heart and your liver.
Why Internal Health Is a Performance Variable
Here's a framing most athletes find useful: your performance is bounded by the health of the systems that support it. You can have perfect training programming and optimised nutrition, but if your liver is under chronic stress and your cardiovascular system lacks the nutritional cofactors it needs, you're leaving a ceiling on what's achievable.
The liver processes everything that enters your body — protein metabolites, supplements, any performance compounds, environmental toxins, alcohol. When it's stressed, detoxification slows, hormone regulation becomes less efficient, and recovery is impaired. The liver doesn't give you obvious warning signs until the damage is significant, which is why athletes — who put more through it than the average person — benefit most from proactive support.
The heart beats over 100,000 times per day. In a training athlete, cardiac output during sessions can be four to five times resting levels. The mitochondria in cardiac muscle cells need a constant supply of CoQ10, vitamin cofactors, and anti-inflammatory support to maintain function across months and years of hard training. Most people don't think about cardiac health until there's a problem — which is exactly the wrong time to start.
The case for stacking heart and liver support is this: they're both under elevated stress in athletes, they both respond to specific nutritional support, and that support works continuously in the background, protecting your capacity to keep training.
What a Well-Designed Heart + Liver Stack Looks Like
Not all combinations are equal. The goal is to cover the key mechanisms for each organ without ingredient overlap or conflict. Here's what the evidence supports:
Liver Support Essentials
TUDCA (650mg) — protects liver cells from apoptosis and supports bile flow under training stress. The highest-priority compound for athletes putting significant load through their liver.
NAC (1,250mg) — replenishes glutathione, the liver's primary antioxidant and detox cofactor. Works synergistically with TUDCA by addressing oxidative stress alongside bile acid protection.
Alpha Lipoic Acid (150mg) — regenerates glutathione and NAC's antioxidant capacity, extending their effectiveness. The combination of NAC + ALA is significantly more effective than either alone.
Choline Bitartrate (500mg) — supports healthy fat metabolism in the liver. Athletes eating high-protein, high-calorie diets have elevated choline requirements that diet alone rarely meets.
Zinc Glycinate (10mg) — supports liver enzyme function and immune defence. The glycinate form is highly bioavailable compared to cheaper zinc forms.
Heart Support Essentials
CoQ10 (200mg + BioPerine) — powers mitochondrial energy production in cardiac muscle and acts as an antioxidant in cardiac cell membranes. The 200mg dose with absorption enhancer ensures plasma elevation into the meaningful range.
Citrus Bergamot (500mg) — clinically studied for lipid metabolism and cardiovascular health. One of the most researched ingredients for cholesterol profile support in athletes.
Curcumin C3 Complex (400mg, 95% curcuminoids) — modulates inflammatory pathways relevant to both vascular health and recovery. The C3 Complex form has better bioavailability than standard curcumin.
Vitamin D3 + K2 MK-7 (50mcg D3 / 200mcg K2) — the essential combination for calcium management. D3 raises calcium absorption; K2 directs it to bone rather than arterial walls.
Apigenin (50mg) — vascular support through vasodilation mechanisms and anti-inflammatory signalling.
Pantethine (300mg) — active form of vitamin B5 that supports healthy lipid metabolism via the Coenzyme A pathway. Research has shown it improves LDL profiles in subjects with elevated cardiovascular risk.
The Problem With Buying These Separately
If you wanted to source each of these compounds individually, here's roughly what you're looking at:
- TUDCA supplement: $40–80/month
- NAC supplement: $25–40/month
- Alpha Lipoic Acid: $20–30/month
- Choline: $15–25/month
- CoQ10 (200mg): $35–60/month
- Citrus Bergamot: $30–50/month
- Curcumin C3: $25–40/month
- D3+K2: $20–30/month
- Apigenin: $30–50/month
- Pantethine: $25–40/month
That's 10 separate products, 10 separate labels to read, and $265–445/month — before dealing with the cognitive load of 10 different dosing schedules.
FITCNT's Full Stack Bundle combines all of this into two daily formulas at $140/month. The math isn't complicated.
How to Take the Full Stack
Both formulas are designed for daily use, not cycle-based protocols. Internal health support is a long game — the benefits accumulate over 30–90 days of consistent use, not from a 4-week cycle followed by a break.
Heart Support (4 capsules/day): Take with your main meal, ideally one containing some dietary fat, to maximise absorption of fat-soluble compounds (CoQ10, Vitamin D3, Apigenin, BioPerine).
Liver Support (4 capsules/day): Can be taken with any meal. If you're training or consuming alcohol in the evening, taking it earlier in the day means it's active during peak hepatic processing hours.
Who Benefits Most From This Stack
The heart + liver stack is most relevant for:
- Strength athletes and bodybuilders — particularly those using oral supplements or performance compounds that increase hepatic load
- Endurance athletes — high-volume training places sustained cardiovascular demand that benefits from targeted heart support
- CrossFit and high-intensity athletes — the combination of cardiac stress and metabolic load from frequent hard sessions makes both organs a priority
- Athletes over 30 — CoQ10 synthesis declines with age; liver efficiency declines with cumulative stress
- Anyone already using pre-workouts or multiple supplements — the liver is processing all of it, daily
Frequently Asked Questions
What is the best supplement stack for athletes?
For internal health, the strongest evidence supports a combination of liver support (TUDCA, NAC, ALA, Choline) and heart support (CoQ10, Citrus Bergamot, Vitamin D3+K2, Curcumin) taken daily. This covers the two organs most stressed by consistent hard training, with each ingredient targeting a specific mechanism rather than duplicating functions.
Can you take heart and liver supplements together?
Yes. Heart support and liver support compounds work through independent mechanisms and do not conflict with each other. The Full Stack is specifically designed for combined daily use. If you're taking prescription medications, check with your healthcare professional first.
How long does a supplement stack take to work for internal health?
Internal support compounds build their effect over 30–90 days of consistent daily use. Unlike stimulant-based pre-workouts with acute effects, these compounds are modifying underlying processes — antioxidant levels, inflammatory signalling, mitochondrial function — that take time to shift and maintain.
Is it better to stack supplements or take them individually?
For efficacy, what matters is the dose of each active ingredient, not whether they're in one product or ten. For practical use, a combined formula eliminates dosing complexity and typically costs less than sourcing each ingredient separately. The risk with combined formulas is under-dosing; FITCNT publishes every dose on the label so you can verify it against research thresholds.
Are FITCNT supplements banned substance free?
Yes. All FITCNT ingredients are third-party lab tested for purity and are not on the WADA prohibited list. The formulas are designed for athletes operating under anti-doping rules, including those competing in Australian sports.
What is the FITCNT Full Stack?
The FITCNT Full Stack Bundle combines Heart Support and Liver Support into a single monthly subscription at $140 AUD (saving $20 versus purchasing separately). Each formula provides a 30-day supply at full clinical doses, delivered to your door with free shipping across Australia.
Always consult your healthcare professional before starting any supplement. FITCNT products are intended for healthy adults 18+.