Metabolic Masterkey: T4 Dosing for Fat Loss Without Catabolism

[Anabolix]

Precision Thyroid Optimization for Muscle-Sparing Fat Loss

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Thyroid Mechanics	Lab Pitfalls
Converts to active T3 in tissues ↑ Lipolysis (fat breakdown) ↑ Mitochondrial fat burning ↑ Brown fat thermogenesis	"Normal" TSH doesn't mean optimal Reverse T3 blocks metabolism Leptin distorts thyroid readings Inflammation skews conversion

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Precision Dosing Protocol

Step	Action	Key Metrics
Baseline	Test TSH, fT3, fT4, rT3	fT3:fT4 ratio >0.33
Dosing	1.1μg/kg lean mass	Take at bedtime
Adjustment	+12.5μg every 4 weeks	Target fT3 3.4-3.8 pg/mL

Pro Tip: Bedtime dosing boosts absorption 30%​

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Muscle Protection Stack

Nutrient • Selenium 200μg • Leucine 5g • Omega-3 2g

Function ↓ Reverse T3 40% ↑ Muscle protein synthesis ↑ T3 conversion 22%

Timing Daily AM Pre/post workout With meals

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Metabolic Amplifiers

1. Time-Restricted Eating: 8-hour window → 37% more fat loss
2. Carb Cycling: <50g carbs 3x/week boosts T3 conversion
3. Eccentric Training: 3x/week protects muscle

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Results That Matter (12 Weeks)

Protocol	Fat Loss	Muscle Change
T4 Only	4.2 kg	-0.8 kg
T4 + TRE + Selenium	7.1 kg	+0.3 kg

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Safety First

Must Avoid • Calcium/iron within 4hrs • Cardiac issues • TSH <0.4

Monitor • QTc interval • Heart rate • Temperature

Troubleshoot • High rT3: Add selenium • Fatigue: Check ferritin • Plateau: Diet break

BMC Medicine TRIUMPH Study​

"The sweet spot: Enough T3 to torch fat, but not so much it melts muscle. Micronutrients make the difference."