Short answer: yes, people commonly take both. The longer answer is worth reading, because the two formulas overlap and the overlap is where you should pay attention.
What overlaps
Both Ultima and Slim are built on glutathione. If you take a full serving of each, you are taking glutathione twice.
This is not automatically a problem. Standard servings of both together generally sit within the range used in clinical research. But it is worth knowing deliberately rather than discovering it later, and it is worth checking the supplement facts panel on both so you know your actual combined daily total rather than guessing from the headline blend weights.
What does not overlap
Everything beyond the glutathione base is distinct.
Ultima pairs glutathione with collagen, aimed at skin tone, hydration and elasticity. It is the formula to pick if your goal is primarily how your skin looks.
Slim pairs glutathione with L-carnitine, garcinia, cordyceps and lion's mane, aimed at metabolism, energy and cognitive focus. It is the formula to pick if your goal is primarily weight management and daily energy.
Those two active sets do not conflict with each other pharmacologically. Taking both is closer to taking two different supplements that happen to share one ingredient than it is to doubling up on one product.
How people usually schedule it
The common pattern is Slim in the morning and Ultima in the evening.
The reasoning is straightforward. Slim contains stimulant-adjacent ingredients through cordyceps and L-carnitine, so morning dosing avoids interfering with sleep. Ultima in the evening sits alongside the body's overnight repair cycle, and collagen is frequently taken at night for the same reason.
Spacing the two also avoids a large combined dose landing on your stomach at once, which is the most common cause of the mild nausea people report when they start both together.
A workable daily structure looks like this:
- Morning, empty stomach: Slim, with water, 30 minutes before breakfast
- Midday, with food: Protect, if you are taking it
- Evening, two hours after dinner: Ultima
Where Protect fits
Protect is pure grape seed extract, not glutathione. It stacks with either or both without adding to your glutathione total, which is exactly why it appears as the free item in most of the bundle tiers rather than as a third glutathione product.
Grape seed extract is a proanthocyanidin-rich antioxidant. Its role in a stack is complementary rather than additive: it works on oxidative load through a different pathway, so it is not competing with the glutathione for the same job.
What not to stack with it
Be careful about running Slim alongside other thermogenic or stimulant products. Garcinia and cordyceps are already in the blend, and layering a separate fat burner or a high-dose pre-workout on top is the most common way people end up with palpitations, jitteriness or disrupted sleep and then blame the wrong product.
Similarly, if you are already taking a standalone collagen supplement, adding Ultima means you are taking collagen twice. That is not dangerous, but you may be paying for the same ingredient in two places.
Start with one
If you have not taken either before, start with one for two to four weeks before adding the second.
The reason is diagnostic, not safety. If something disagrees with you, starting one at a time tells you which product caused it. Starting both simultaneously tells you nothing, and most people in that situation stop both and write off the whole category.
The Ultima 30-capsule trial size is a low-commitment way to run that first month.
A sensible 90-day approach
- Weeks 1 to 4: One product only, at the standard serving. Photograph your starting point in consistent lighting.
- Weeks 5 to 8: Add the second product if the first is well tolerated. Keep the morning and evening split.
- Weeks 9 to 12: Hold steady. This is the window where changes in skin tone typically become visible, given cell turnover runs on a 28 to 40 day cycle.
- End of week 12: Compare photographs, not memory, and decide.
Before you stack
If you take prescription medication, particularly for thyroid, blood pressure or blood sugar, check with a doctor or pharmacist first. Garcinia has documented interactions with blood sugar medication, and cordyceps can affect immune-modulating drugs. A stack is harder to reason about than a single product, and the interaction risk is where the two formulas differ most.
Buying for a 90-day run
A single bottle of either formula covers roughly a month, so a three-month trial means three bottles minimum. Multi-bottle sets bring the per-bottle cost down: the Ultima 3 plus 2 Protect set covers the stack described above in one purchase, and every current tier is listed in the bundle collection.