Maca Extract
A Peruvian root vegetable with the most encouraging human research of any botanical in this blend.
Why Maca Is in Jelly Fill
A high-altitude Peruvian root eaten as a food crop, with the most encouraging human research of any botanical in this blend. It is one of the nine components of the Jelly Fill proprietary blend, and this page covers what it is, the research context, its role here and the cautions attached to it.
The Jelly Fill blend is 82 mg in total — and that number matters
The label lists a single proprietary blend of 82 mg covering all nine components, noted as equivalent to roughly 567 mg of dry powders. No individual amount is published except caffeine at 5 mg.
That total is worth putting in context. Ashwagandha trials typically use 300–600 mg of extract daily. Maca studies commonly use 1.5–3 grams. L-arginine research generally uses several grams. Tribulus trials often exceed 750 mg. The entire blend here is 82 mg spread across nine ingredients.
This is not a criticism of any single ingredient — it is the arithmetic the label itself provides. It is also why no milligram figures for individual ingredients appear anywhere on this website: they are not published, and inventing them would be worse than leaving them out.
What Maca in Jelly Fill Is
Maca is Lepidium meyenii, a root vegetable grown in the Peruvian Andes at altitudes above 4,000 metres, where very little else survives. It has been cultivated as a food crop for centuries and is eaten as a vegetable, not just taken as a supplement.
That food history matters for safety: unlike most botanicals in men's formulas, maca has been consumed in meaningful quantities by whole populations for a very long time.
Its characteristic compounds are glucosinolates and macamides, the latter unique to the plant. Colours vary — yellow, red and black — and some research suggests the varieties differ in effect.
The Research Context Behind Maca in Jelly Fill
Maca has the best human evidence of any botanical in this formula, which is worth saying plainly given how much of this website is qualification.
Several small randomised controlled trials have examined maca for sexual desire in men, with a number reporting improvements over placebo after several weeks. A systematic review concluded there was limited evidence suggesting an effect on libido, while noting the trials were small.
Research has also looked at sperm parameters, mood and energy, with some positive findings.
One consistent and interesting result: maca's libido effects in these trials appeared independent of testosterone. Studies measuring hormones generally found no change, which means whatever maca does, it is not doing it by raising testosterone. That is a useful corrective to how this category usually markets itself.
Why Maca Is Included in Jelly Fill, and at What Amount
It is the most defensible botanical in the blend, and the one a formulator could point to with a straight face.
The amount is the problem. Maca trials typically used 1.5 to 3 grams daily, and maca is traditionally eaten in far larger quantities still. The entire Jelly Fill blend is 82 mg across nine ingredients.
Even if maca made up the whole blend — which it does not — 82 mg would be a small fraction of a studied dose. That arithmetic is worth doing before expecting the trial results to apply.
Responsible Expectations and Safety for Maca in Jelly Fill
Expect the ingredient to be reasonable and the amount to be small. If maca specifically interests you, it is inexpensive and widely available as a standalone powder at doses matching the research, which is a more direct route than a blend.
Safety notes. Maca is generally well tolerated, with a long history of dietary use supporting that. Reported effects are mild and infrequent: digestive upset, and occasionally disturbed sleep if taken late.
Because it is a cruciferous vegetable containing glucosinolates, people with thyroid conditions are sometimes advised to be cautious, particularly with raw preparations. Anyone with a hormone-sensitive condition should mention it to their doctor.
How to read the research on this Jelly Fill page
The studies described here examined individual ingredients, usually on their own, at doses set by the researchers — doses that are generally far higher than an 82 mg blend can deliver.
That research provides context for why an ingredient appears in a formula. It does not demonstrate that the finished Jelly Fill product produces the same outcomes. No clinical trial of this finished formula has been published.
Related Jelly Fill Reading
The main ingredients page sets out how all nine components sit together, and how Jelly Fill works explains the daily routine and the amounts involved.
More Jelly Fill Ingredients
Muira Puama Extract
An Amazonian shrub bark with a long history of traditional use and, honestly, very little modern human research behind it.
Brazilian barkCatuaba Extract
A Brazilian tree bark used in traditional preparations, with essentially no controlled human trials to draw on.
Catechins and antioxidantsGreen Tea Extract
A well-researched leaf extract supplying catechins — and part of the reason the "no stimulants" claim does not hold up.
5 mg — the only disclosed amountCaffeine
The single ingredient with a published figure on the label, and at 5 mg it is a very small amount indeed.
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