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TestoFuel and TestoPrime start from the same labelled D-aspartic acid amount, so neither wins a training argument on that ingredient. Their supporting formulas differ much more. We favour Testogen overall and DBULK for a dedicated muscle-oriented choice.
Overall formula pick
Testogen Ultimate
Testogen is the strongest overall fit for our preferred daily-support formula. DBULK is our muscle-building option; the named pair is best separated by botanical preference and suitability.
Explore TestogenThe formula comparison
TestoFuel
published 10-ingredient TestoFuel formula; 4 capsules.
Amounts refer to the stated serving for each product, not one capsule. Extract weights, raw-herb equivalents and elemental mineral amounts are different measurements.
Swipe the table to see every product column.
| Ingredient | Testogen Ultimate 4 capsules |
TestoFuel 4 capsules |
TestoPrime 4 capsules |
|---|---|---|---|
| D-aspartic acid | 2,025 mg | 2,000 mg | 2,000 mg |
| Ashwagandha | 200 mg; KSM-66 root extract | Not included | 55.68 mg; KSM-66 root extract, equivalent to 668 mg root powder |
| Fenugreek | 100 mg; seed extract, at least 50% saponins | 50 mg; seed extract, equivalent to 800 mg seed powder | 200 mg; seed extract 4:1, equivalent to 800 mg powder |
| Panax ginseng | 100 mg; extract, 5% ginsenosides | 100 mg; Asian red Panax ginseng extract | 50 mg; extract 8:1, equivalent to 400 mg powder |
| Nettle | 80 mg; root extract, 10:1 | Not included | Not included |
| Black pepper extract | 7 mg; BioPerine, 95% piperine | Not included | 6.68 mg; fruit extract, 95% piperine |
| Vitamin D3 | 100 mcg (4,000 IU); cholecalciferol | 100 mcg (4,000 IU); cholecalciferol | 26.68 mcg; from Cladonia rangiferina |
| Vitamin K2 | 90 mcg; menaquinone-7 (MK-7) | Included; amount and specific K2 form not verified because the online table has inconsistent units | Not included |
| Vitamin B6 | 8 mg; pyridoxal-5-phosphate (P5P) | Not included | 5.6 mg; P5P |
| Magnesium | 80 mg; bisglycinate and citrate | Included as magnesium aspartate; amount not verified because the online table has inconsistent units | Not included |
| Zinc | 25 mg; monomethionine | 10 mg; monomethionine and aspartate | 40 mg; citrate |
| Copper | 0.5 mg; bisglycinate | Not included | Not included |
| Boron | 5 mg; bisglycinate | 8 mg; chelate, specific chelate not identified | Not included |
| Maca | Not included | 180 mg; root extract, equivalent to 1,800 mg root powder | Not included |
| Oyster | Not included | 100 mg; extract | Not included |
| Vitamin B5 | Not included | Not included | 8 mg; D-calcium pantothenate |
| Green tea | Not included | Not included | 200 mg; extract, 75% catechins, equivalent to 4,000 mg powder |
| Garlic | Not included | Not included | 16 mg; extract, 11,000 ppm allicin, equivalent to 450 mg powder |
| Pomegranate | Not included | Not included | 8 mg; extract, 40% ellagic acid, equivalent to 360 mg powder |
“Not included” indicates confirmed absence from the assessed formula. “Not verified” identifies a gap in the information available for this comparison; it does not mean the manufacturer hides the amount.
Testogen Ultimate: 13 active ingredients. Mineral figures are nutrient amounts, not the weight of the full mineral compound.
TestoFuel: All 10 active ingredients are shown. The manufacturer’s online magnesium and K2 entries contain conflicting units; both ingredients are present, but those two quantities require a bottle-panel check.
Capsule and other ingredients
Testogen Ultimate: Vegetable-cellulose capsule and NuFLOW rice-hull ingredient.
TestoFuel: Vegetable-cellulose capsule. Contains oyster.
TestoPrime: Hypromellose, microcrystalline cellulose, silica, magnesium stearate and maltodextrin.
TestoPrime
original 12-ingredient TestoPrime, not TestoPrime Gold; 4 capsules.
Two grams does not tell you which builds more muscle
Both formulas declare 2,000 mg D-aspartic acid. That shared amount makes the ingredient a poor separator, and the human training evidence does not justify a promised gain from either product. 1
TestoFuel adds maca and oyster while TestoPrime has KSM-66 and other plant extracts. Choosing between those approaches is more defensible than ranking one as inherently more athletic. Oyster avoidance, in particular, can decide the question before any performance discussion.
How Testogen changes the comparison
Testogen includes 200 mg KSM-66 and a broad nutrient profile in the same serving. Original TestoPrime lists 55.68 mg of that extract; TestoFuel does not include it. Testogen also specifies its magnesium, zinc and other mineral forms.
This is a reason to prefer the entire formula, not a claim that a few shared ingredients establish matching study outcomes. TestoFuel still has a distinct nutrient-and-botanical mix, and TestoPrime's plant extras may suit someone who deliberately wants them.
The DBULK option for a muscle-building goal
DBULK moves the decision from a general testosterone blend towards a muscle-focused supplement. Its leucine, MSM and ashwagandha combination gives it a role of its own. We would choose the intended role first, rather than buy overlapping products on the assumption that separate brand promises must add together.
- Muscle-oriented formula with L-leucine, ashwagandha and MSM.
- Also described with puncture vine, sodium hyaluronate, suma and vitamin D3.
- Three capsules daily on the product page; follow the directions on the supplied bottle.
Inside our overall pick: Testogen Ultimate
- Formula coverage
- 13 actives, all amounts disclosed; four-capsule daily serving
- Botanical specification
- KSM-66 root extract 200 mg; Panax ginseng 100 mg at 5% ginsenosides; nettle root 80 mg at 10:1
- Further active amounts
- D-aspartic acid 2,025 mg; fenugreek extract 100 mg; BioPerine 7 mg
- Mineral detail
- Zinc monomethionine 25 mg; magnesium 80 mg as bisglycinate and citrate; boron bisglycinate 5 mg; copper bisglycinate 0.5 mg
- Vitamins
- D3 100 mcg; K2 90 mcg as MK-7; B6 8 mg as P5P
- Clean-label design and heritage
- Vegetable cellulose and NuFLOW; brand developed since 2014, now in its fourth generation
Ingredient breadth, disclosed quantities and named forms explain the selection. They are not measurements of testosterone change, strength or muscle gained from this finished formula.
Explore the full Testogen formulaChoose by the goal behind the search
Testogen Ultimate
Broad formula, named premium forms and fully stated active amounts.
Compare Testogen optionsBrutal Force DBULK
A training-oriented ingredient mix to assess for a specific muscle-building goal.
See the DBULK formulaTesTotal
A more economical route when a smaller testosterone-support formula fits.
Check TesTotal optionsSuitability alongside your existing routine
Review overlapping vitamins, minerals and herbs before adding a product to an existing training stack. Testogen contains 4,000 IU (100 mcg) D3, so its dose needs to be considered with other sources. A preferred formula is not automatically suitable for every user. 2
Unwanted reactions warrant stopping the product and obtaining appropriate advice. Ongoing symptoms need proper assessment; this comparison cannot diagnose testosterone deficiency or replace treatment. 3