How many daily calories should I target when running Durabol 100 for lean mass?

A structured surplus of 250–400 kcal above your calculated total daily energy expenditure is the evidence-aligned starting point. Nandrolone phenylpropionate shifts nutrient partitioning in favour of lean tissue, so a modest surplus — rather than an aggressive one — typically produces cleaner gains. Track bodyweight weekly and adjust intake by 100–150 kcal increments based on rate-of-gain data.

What protein intake is recommended per kilogram of bodyweight on an NPP cycle?

Target 2.0–2.4 g of protein per kilogram of bodyweight daily. Nandrolone phenylpropionate elevates nitrogen retention at the muscle-fibre level, meaning dietary protein is used more efficiently for anabolic synthesis. Distributing intake across four to five meals of 35–50 g each maximises muscle protein synthesis rates across the day, based on leucine-threshold research in trained subjects.

Can Durabol 100 help preserve muscle tissue during a calorie-deficit phase?

Yes — nandrolone phenylpropionate provides meaningful anti-catabolic support during a controlled deficit. Androgen receptor activation suppresses muscle-protein breakdown pathways, allowing a 300–500 kcal daily deficit to proceed without the degree of lean-tissue loss typically observed under energy restriction without pharmacological support. Protein intake should remain at the upper end of the recommended range (2.2–2.4 g/kg) during deficit phases.

How does the 100mg/ml concentration of Durabol 100 help with dose adjustments across nutritional phases?

At 100mg/ml, each 0.1ml drawn into a standard 1ml syringe equals a 10mg dose increment — the finest resolution available in this NPP product group. When transitioning between a surplus and a deficit phase, practitioners commonly reduce weekly NPP dose alongside caloric reduction; this concentration allows those milligram-level adjustments to be made without rounding errors or imprecise volume draws.

What are the storage and handling requirements for the Durabol 100 10ml vial after opening?

Store the vial at room temperature (15–25°C), away from direct light and humidity. Refrigeration is not required but prolongs oil stability. After the rubber septum has been punctured, use a fresh sterile needle for each withdrawal to prevent contamination across multiple draws. A 10ml vial at 100mg/ml supports extended cycle protocols without requiring frequent reorder, provided aseptic technique is maintained throughout. (2) angle_used

Recomp Optimizer

British Dragon

Durabol 100 100mg/ml 10ml Vial by British Dragon

Name: Durabol 100
Brand: British Dragon
SKU: INJ-NAPP-BRD-100-019
Price: 28.00 EUR
Availability: InStock

Durabol 100 is British Dragon's nandrolone phenylpropionate injectable, delivering 100mg of active compound per millilitre across a 10ml multi-dose vial — purpose-suited to athletes who calibrate nutrition and calorie targets around their anabolic cycle. The 100mg/ml concentration enables granular dose adjustments that align directly with shifting caloric phases, whether a controlled surplus for lean mass or a deficit-phase tissue-retention strategy. HPLC potency verification and LAL endotoxin clearance are completed at the finished-product stage before any batch leaves the British Dragon facility.

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In stock

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Enhances nitrogen retention at the myocyte level, improving dietary protein utilisation during both surplus and deficit phases
Supports lean tissue preservation under controlled caloric restriction through androgen receptor-mediated anti-catabolic signalling
100mg/ml concentration provides 10mg dose increments for phase-to-phase nutritional adjustments without measurement errors
Phenylpropionate ester allows cycle length flexibility, making it easier to align NPP exit with planned dietary phase transitions
HPLC-verified potency ensures the milligram dose entered into calorie and macronutrient calculations reflects the actual compound delivered
10ml multi-dose vial format reduces per-dose cost while covering extended nutrition-phased protocols without reorder interruption

Phase	Weekly Dose	Injection Frequency	Note
Lean Bulk (Caloric Surplus +250–400 kcal)	200–300 mg	Every other day	Pair with protein at 2.0–2.2 g/kg/day; prioritise post-training carbohydrate window
Recomp (Maintenance Calories ±0–150 kcal)	150–200 mg	Every other day	Keep fat intake ≥0.8 g/kg/day; adjust total calories based on weekly bodyweight trend
Deficit / Tissue Preservation (–300–500 kcal)	100–150 mg	Twice weekly	Raise protein to 2.2–2.4 g/kg/day to offset elevated muscle-protein breakdown risk under deficit

Key takeaways

Calibrate your caloric surplus to 250–400 kcal above TDEE on cycle.
Set dietary protein at 2.0–2.4 g per kilogram bodyweight daily.
Time your largest carbohydrate serving within two hours post-training.
Maintain fat intake above 0.8 g/kg to protect hormonal precursor availability.
Use Durabol 100's 10mg-per-0.1ml precision to match dose to nutrition phase.

Durabol 100 as a Nutrition-Phase Anchor

Durabol 100 is a precision-dosed nandrolone phenylpropionate formulation whose primary practical role is as a nutritional-phase management tool: the compound alters how skeletal muscle responds to caloric intake, making diet structure — not just training — a key variable for cycle outcomes. Nandrolone phenylpropionate enhances nitrogen retention in myocytes, which means a higher fraction of dietary protein is directed toward anabolic net balance rather than oxidative fuel. Studies using nitrogen balance methodology in resistance-trained subjects have documented improved net protein retention under nandrolone administration even when total calorie intake remains fixed.

Caloric Surplus vs. Deficit — How Durabol 100 Shifts the Equation

On a measured caloric surplus — typically 250–400 kcal above total daily energy expenditure as calculated by indirect calorimetry or validated predictive equations — nandrolone phenylpropionate supports lean tissue accrual with comparatively lower collateral fat gain than an equivalent surplus without androgenic support. Compared to running the same surplus without an anabolic agent, subjects using NPP in clinical nitrogen-balance models partitioned a measurably greater share of surplus energy toward lean-mass deposition. During a caloric deficit, Durabol 100 acts as an anti-catabolic buffer: androgen receptor activation suppresses muscle-protein breakdown signalling, enabling athletes to sustain a 300–500 kcal daily deficit without the lean-tissue losses typically seen under energy restriction alone.

Protein Targets and Macronutrient Structure on Cycle

Protein intake on a Durabol 100 cycle should be held between 2.0 and 2.4 g per kilogram of bodyweight per day, a range supported by meta-analyses of protein dose-response in resistance-trained individuals under elevated anabolic signalling. Carbohydrate timing matters: positioning the largest carbohydrate serving within two hours post-training exploits elevated glycogen synthase activity documented following resistance exercise with androgen receptor activation. Fat intake is maintained at a minimum of 0.8 g per kilogram per day to preserve endogenous steroid hormone precursor availability — dropping dietary fat below this threshold risks suppressing residual luteinising hormone sensitivity during cycle.

Quality Assurance and Concentration Precision

Every Durabol 100 batch undergoes reversed-phase HPLC quantification against a certified nandrolone phenylpropionate reference standard; each vial must return a potency result within ±2% of the 100mg/ml label claim. LAL endotoxin testing provides a secondary safety gate before batch release. At 100mg/ml — the lowest concentration in this comparative NPP group — each 0.1ml increment drawn into a standard 1ml syringe represents a 10mg dose step, giving nutrition-conscious athletes the resolution to fine-tune weekly milligram totals as caloric phases shift.

Usage

Calculate your total daily energy expenditure using a validated equation (e.g. Mifflin-St Jeor with an activity multiplier) before beginning the cycle, so caloric targets for each nutritional phase are defined in advance.
Set your weekly Durabol 100 dose relative to your current nutrition phase: higher doses support surplus phases; lower doses are appropriate when moving into a caloric deficit.
Draw the required volume using a fresh sterile needle and a 1ml syringe; at 100mg/ml each 0.1ml graduation equals 10mg, allowing precise dose alignment with your weekly milligram target.
Inject into a large muscle group (gluteus, vastus lateralis) using an aseptic technique; rotate sites across every-other-day administrations to reduce local tissue loading.
Time your largest daily carbohydrate serving within two hours of your training session to exploit the elevated glycogen synthase activity associated with resistance exercise under androgen receptor stimulation.
Log each injection date, volume drawn, and your daily caloric intake in the same tracking document — correlating dose data with nutritional intake allows you to identify the phase conditions producing the best lean-mass response.

Warnings

Contraindications: Not for use in individuals with androgen-sensitive malignancies, active hepatic impairment, uncontrolled cardiovascular disease, or hypersensitivity to nandrolone or carrier oil components. Contraindicated in women who are pregnant or may become pregnant.

Side Effects: Androgenic effects including acne, accelerated scalp hair thinning, and changes in sebum production may occur. Progestogenic activity may contribute to water retention and mood variation in susceptible individuals. Haematocrit elevation and HDL suppression have been documented in nandrolone-use pharmacovigilance data and warrant monitoring.

Monitoring: Obtain a baseline lipid panel, full blood count, and liver enzyme profile before cycle initiation. Repeat lipid and haematocrit testing at the midpoint of the cycle. Monitor blood pressure and body composition metrics weekly to validate that caloric targets are producing the intended lean-mass response.

PCT: Nandrolone phenylpropionate suppresses the hypothalamic-pituitary-gonadal axis; post-cycle therapy using a SERM (e.g. tamoxifen or clomiphene) is required. The phenylpropionate ester clears measurably faster than long-chain nandrolone esters, enabling earlier PCT initiation — typically within 5–7 days of the final injection based on ester clearance pharmacology.

Frequently asked questions

How many daily calories should I target when running Durabol 100 for lean mass?: A structured surplus of 250–400 kcal above your calculated total daily energy expenditure is the evidence-aligned starting point. Nandrolone phenylpropionate shifts nutrient partitioning in favour of lean tissue, so a modest surplus — rather than an aggressive one — typically produces cleaner gains. Track bodyweight weekly and adjust intake by 100–150 kcal increments based on rate-of-gain data.
What protein intake is recommended per kilogram of bodyweight on an NPP cycle?: Target 2.0–2.4 g of protein per kilogram of bodyweight daily. Nandrolone phenylpropionate elevates nitrogen retention at the muscle-fibre level, meaning dietary protein is used more efficiently for anabolic synthesis. Distributing intake across four to five meals of 35–50 g each maximises muscle protein synthesis rates across the day, based on leucine-threshold research in trained subjects.
Can Durabol 100 help preserve muscle tissue during a calorie-deficit phase?: Yes — nandrolone phenylpropionate provides meaningful anti-catabolic support during a controlled deficit. Androgen receptor activation suppresses muscle-protein breakdown pathways, allowing a 300–500 kcal daily deficit to proceed without the degree of lean-tissue loss typically observed under energy restriction without pharmacological support. Protein intake should remain at the upper end of the recommended range (2.2–2.4 g/kg) during deficit phases.
How does the 100mg/ml concentration of Durabol 100 help with dose adjustments across nutritional phases?: At 100mg/ml, each 0.1ml drawn into a standard 1ml syringe equals a 10mg dose increment — the finest resolution available in this NPP product group. When transitioning between a surplus and a deficit phase, practitioners commonly reduce weekly NPP dose alongside caloric reduction; this concentration allows those milligram-level adjustments to be made without rounding errors or imprecise volume draws.
What are the storage and handling requirements for the Durabol 100 10ml vial after opening?: Store the vial at room temperature (15–25°C), away from direct light and humidity. Refrigeration is not required but prolongs oil stability. After the rubber septum has been punctured, use a fresh sterile needle for each withdrawal to prevent contamination across multiple draws. A 10ml vial at 100mg/ml supports extended cycle protocols without requiring frequent reorder, provided aseptic technique is maintained throughout. (2) angle_used

Manufacturer

British Dragon's current product portfolio is structured around compound-and-ester specificity rather than broad concentration coverage, and Durabol 100 sits within the brand's nandrolone sub-range alongside the longer-acting Decabol 250 — two products that share an active steroid nucleus but differ in ester, release profile, and intended cycle architecture. The portfolio architecture reflects a deliberate decision to offer practitioners compound options matched to phase length and injection-frequency preference rather than consolidating nandrolone into a single SKU. Quality control for Durabol 100 follows the same two-stage documented protocol applied across the British Dragon injectable line: upstream nandrolone phenylpropionate API is reviewed against certificate-of-analysis specifications before formulation proceeds, and finished vials are released only after reversed-phase HPLC potency quantification returns a result within ±2% of the 100mg/ml label claim, with LAL endotoxin testing providing a parallel safety clearance.

Product details

Brand	British Dragon
Active ingredient	nandrolone phenylpropionate
Also known as	NPP, Nandrolone Phenylpropionate, Pheno-NPP, Durabol 100, British Dragon NPP
Strength	100 mg
Form	Vial
Pack size	1 piece
Item number	INJ-NAPP-BRD-100-019

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