THE SCIENCE
Why We Show Our Work
At Earthkiss we believe you deserve to understand exactly what you're putting in your body and why. Every ingredient in our products was chosen because the science supports it — not because it was trendy or cheap. Below you'll find plain-English summaries of the research behind each key ingredient, with links to the peer-reviewed studies so you can read them yourself.
Functional Mushrooms — The Foundation of Cellular Support
Functional mushrooms have been used in traditional medicine for thousands of years. Modern science is now confirming what ancient practitioners understood intuitively — that these mushrooms contain powerful bioactive compounds that support immune function, cellular energy, and healthy aging at a fundamental level.
ReBuild contains Organic Cordyceps Militaris as its primary functional mushroom — chosen specifically for its mitochondrial support and energy production benefits. As research continues to expand in this category, functional mushrooms represent one of the most promising intersections of nature and science in modern wellness.
→ Read the Research: Medicinal Mushrooms — Comprehensive Review, PMC/NIH 2020
NMN & NAD+ — The Energy Currency of Your Cells
NAD+ is a molecule your body produces naturally — and it is essential for energy production, DNA repair, and cellular function. The problem is that NAD+ levels decline significantly with age, and that decline is directly linked to fatigue, brain fog, and accelerated aging. NMN (Nicotinamide Mononucleotide) is a direct precursor to NAD+ — meaning your body uses it to produce more NAD+ naturally. In a 2023 randomized, double-blind, placebo-controlled clinical trial, participants taking 300mg of NMN daily showed statistically significant increases in blood NAD+ levels within 30 days.
The same study found improvements in physical performance and overall health scores compared to placebo. A separate 2024 study found that 12 weeks of NMN supplementation maintained walking speed and improved sleep quality in older adults — with no adverse effects observed.
→ Read the Research: Clinical Trial — Yi et al., 2023 (PubMed)
→ Read the Research: Safety & Anti-Aging Review — Song et al., 2023 (PubMed)
→ Read the Research: Sleep & Walking Speed Study — 2024 (PMC)
Cordyceps Militaris — Mitochondrial Support & Sustained Energy
Cordyceps is a functional mushroom with centuries of use in traditional Chinese medicine for energy, stamina, and relief from fatigue. Modern research has confirmed what practitioners have known for generations — Cordyceps works by increasing cellular ATP production, which is the primary fuel source your mitochondria use to generate energy. It also supports oxygen utilization, which is why it has been studied extensively in athletic performance research.
A systematic review and meta-analysis found that Cordyceps supplementation significantly improved endurance performance, ventilatory threshold, and aerobic capacity. A separate study on healthy elderly subjects found meaningful improvements in exercise capacity after six weeks of Cordyceps supplementation. ReBuild contains 400mg of Organic Cordyceps Militaris — working in parallel with NMN to support your body's energy production from two directions simultaneously.
→ Read the Research: Meta-Analysis — Frontiers in Nutrition, 2025
→ Read the Research: Elderly Exercise Study — PMC
→ Read the Research: Cellular Energy Production Study — PMC
Why Two NAD+ Pathways Matter
Most products on the market support NAD+ from a single direction. ReBuild was formulated differently — intentionally. NMN supports NAD+ biosynthesis through the salvage pathway. Cordyceps supports mitochondrial energy production and ATP synthesis independently. Together they address cellular energy from two angles, which is why the combination is more powerful than either ingredient alone.
This is the difference between a supplement and a formula.
Gut Health — Prebiotics, Probiotics & the Fatigue Connection
Your gut microbiome does far more than digest food. Emerging research is establishing a direct link between gut health and fatigue, inflammation, and cognitive function. When your gut microbiome is compromised, the downstream effects show up everywhere — in your energy levels, your immune response, and your mental clarity.
ReBuild contains both Inulin (a prebiotic that feeds beneficial bacteria) and LactoSpore® (a clinically studied probiotic strain) — because cellular wellness starts in the gut. A healthy microbiome reduces the inflammatory burden your body carries, which frees up energy for everything else.
→ Read the Research: Gut Microbiome: A New Frontier for Chronic Fatigue — Medical Xpress, 2025