Most people don't take one supplement — they take two or three, stacked into a morning and a night routine. That's normal, and for most combinations across Proco's range, it's fine: different ingredients, no overlap, no reason to think twice. But two of our products are both built to help you sleep, both contain melatonin, and taking them on the same night stacks the dose in a way that's easy to miss and worth knowing about before it happens.
This post walks through exactly which Proco products share ingredients, where that overlap actually matters, and where it doesn't. No vague reassurance — the real numbers, product by product.
Before getting into ingredients: "safe to combine" and "worth combining" are two different questions. Most of what follows is about the first. A few of our products genuinely have nothing to conflict with — you could take them together indefinitely without a second thought. Two of them, on the other hand, were never designed to be taken on the same night, and the reason isn't subtle once you look at the label.
The one combination to avoid: Sleep Support + Sleep Formula
Sleep Support and Sleep Formula are both sleep products. That sounds obvious, but it's the reason people occasionally reach for both in the same night — they see "sleep" on both labels and assume they're complementary, like magnesium and omega-3. They're not. They're two different approaches to the same problem, and they overlap heavily on actives.
Sleep Support (2 capsules) contains 10mg of melatonin. Sleep Formula (2 capsules) contains 2mg of melatonin. Take both in one night and you've taken 12mg.
For context: a 2024 dose-response meta-analysis of randomized controlled trials found that melatonin's effect on sleep onset doesn't keep climbing with higher doses — it plateaus, with doses around 4mg performing about as well as much higher ones for falling asleep faster1. Sleep Support's own product page already flags that its 10mg dose sits above that studied range. Layering Sleep Formula's 2mg on top pushes the combined dose to roughly three times it. Melatonin is not considered highly dangerous at higher single doses the way some drugs are, but "not dangerous" isn't the same as "does anything useful" — next-day grogginess, vivid or disrupted dreaming, and a groggy, hard-to-shake wake-up are the more likely outcomes of overshooting, not better sleep.
The two products also share four other calming botanicals. It's not just melatonin stacking — it's the same category of ingredient showing up twice.
| Ingredient | Sleep Support | Sleep Formula |
|---|---|---|
| Melatonin | 10mg | 2mg |
| Chamomile | Yes (blend) | 100mg |
| Lemon balm | Yes (blend) | 100mg |
| Passion flower | Yes (blend) | 100mg |
| GABA | Yes (blend) | 100mg |
| L-tryptophan | Yes (blend) | 100mg |
Sleep Formula individually doses each ingredient on the label, so we can show you exactly what's in a serving. Sleep Support bundles most of its botanicals into a blend, disclosed as a group rather than ingredient by ingredient — which is a separate labeling issue we've written about elsewhere, but it doesn't change the practical point here: five overlapping ingredients between two products is a real overlap, not a coincidence of formulation.
Why would anyone end up taking both in the first place? Usually not by design — it's someone who already has Sleep Formula in their routine, has a rough night, sees Sleep Support marketed as a stronger option, and adds it on top rather than swapping one for the other. Or it's a household where one person uses each product and they end up in the same hand by mistake. Either way, the fix is the same: these are two versions of the same job, not two jobs. Use one.
Sleep Support's melatonin dose, on its own
Worth saying plainly, separate from the stacking issue: 10mg of melatonin is already above the roughly 4mg range that dose-response research has found near-optimal for sleep onset1. That's true whether or not you're also taking Sleep Formula. If you use Sleep Support on its own and it works well for you, that's your call to make — melatonin's dose-response curve is a population-level finding, not a rule that applies identically to every person. But it's a data point worth having, not something to find out by trial and error.
GABA in two products — Cognitive Support and Sleep Support
GABA also shows up in Cognitive Support, which is a different situation from the melatonin overlap above. Cognitive Support is meant for daytime use and Sleep Support for nighttime, so if you're taking Cognitive Support in the morning and Sleep Support before bed, you're not taking both at once — there's no same-dose stacking the way there is with Sleep Support and Sleep Formula.
That said, if you're the type of person who tracks total intake of a given ingredient across everything you take in a day, it's fair to want to know your total GABA exposure. We can't give you that number honestly right now: neither Cognitive Support nor Sleep Support discloses its GABA dose individually today — both list it as part of an undisclosed blend. GABA happens to be the ingredient we're tackling first as we work through per-ingredient disclosure across the range, but until that lands on both labels, the combined daily total isn't something we can calculate for you, and we're not going to estimate it and present that as fact. If exact per-ingredient dosing matters to you, that's a real limitation of these two products as they're currently labeled, not something we want to talk around.
Magnesium Glycinate + Sleep Support
Magnesium Glycinate delivers 275mg of elemental magnesium as magnesium glycinate. Sleep Support separately contains magnesium citrate. Take both and you're combining two magnesium sources in one day — not dangerous at typical doses for most healthy adults, but worth being deliberate about rather than accidental, especially if you already have digestive sensitivity to magnesium or a kidney condition. We've written a full breakdown of safe upper limits and what happens above them in How much magnesium is too much? — that's the right place to check your total rather than us re-deriving the numbers here.
What stacks fine, no caveats
Creatine Monohydrate (discontinued from the Proco range) and Omega-3 are both single-ingredient products with nothing in Proco's range that overlaps with them. Creatine is creatine monohydrate, full stop. Omega-3 is EPA and DHA from fish oil. Neither shares an active with anything else we sell, so there's no interaction case to make — they stack cleanly with everything, including each other, as covered in Can you take omega-3 and creatine together?
Cognitive Support contains caffeine, which has no interaction concern alongside Omega-3, Creatine, or Magnesium Glycinate. The only thing to manage with caffeine is timing, not combination — taken late in the day it can push back your sleep onset regardless of what else you're taking. See Does Cognitive Support contain caffeine? for the specifics and how early in the day to cut it off if sleep is a priority.
Practical stacks by use case
Focus stack (daytime): Cognitive Support + Omega-3. No overlapping actives, no conflicts. Take Cognitive Support early enough that its caffeine has cleared your system well before bed.
Sleep (nighttime): Sleep Support or Sleep Formula — never both in the same night. If you want individually dosed ingredients and a smaller, better-studied melatonin dose, that's Sleep Formula. If you want the higher-melatonin, blend-based formula, that's Sleep Support. Either is a complete sleep routine on its own.
General health baseline: Magnesium Glycinate + Omega-3 covers two well-established, non-overlapping bases and stacks with either the focus stack or a sleep product without any of the concerns above.
If you want a more general framework for building a stack rather than just this list, Building a Proco stack walks through the reasoning in more depth.
Bottom line
Most Proco products stack without any issue — that's true of Omega-3, Creatine, Magnesium Glycinate, and Cognitive Support relative to each other. The exception is real and specific: Sleep Support and Sleep Formula are both sleep products with overlapping actives, including melatonin at 10mg and 2mg respectively, and taking both the same night means 12mg in one dose — roughly three times the range dose-response research has found near-optimal for falling asleep. Pick one sleep product, not both. Beyond that, be aware of combined magnesium totals if you're taking Magnesium Glycinate alongside Sleep Support, and know that GABA's exact combined dose across Cognitive Support and Sleep Support stays uncalculable for now — that fix is first in line as we roll out individual ingredient doses, but it hasn't reached either label yet.
This article is for informational purposes only and has not been evaluated by the FDA. It is not intended to diagnose, treat, cure, or prevent any disease. If you take any prescription medication or have a health condition, talk to your doctor before combining supplements.
References
- Optimizing the Time and Dose of Melatonin as a Sleep-Promoting Drug: A Systematic Review of Randomized Controlled Trials and Dose-Response Meta-Analysis, Journal of Pineal Research, 2024.
Related reading: Sleep Formula vs. Sleep Support: how to choose and Melatonin: the real dose-response evidence.
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