Why I supplement glycine, not melatonin — and what it taught me about toothpaste

For years the wellness internet kept handing me the same prescription: take melatonin. I never did. I take glycine, n-acetylcysteine, and magnesium most evenings, and the moment the sun goes down I wear blue-blocking glasses. The result is sleep that feels structurally normal, not chemically administered.

The reason matters, because it's the same reason PrimalDent doesn't contain hydroxyapatite.

Melatonin is a hormone. The body makes its own. The pineal gland synthesizes it from tryptophan, by way of serotonin, on a schedule cued by darkness. The metabolic pathway has cofactors and dependencies — glycine, magnesium, the antioxidant capacity NAC supports — and inputs that suppress it, the most aggressive of which is blue-spectrum light at night. If you give the system its inputs and remove its blockers, it produces melatonin endogenously, on its own clock, with the regulatory feedback loops two hundred thousand years of evolution built into the loop.

If you take a melatonin pill, none of that runs. You bypass the regulator and inject the end-state hormone. It works in the sense that you fall asleep. It also doesn't work in the sense that you've taught the system nothing, fed the system nothing, and asked the body to handle a hormone surge it didn't generate. You've solved a downstream problem with a downstream patch.

I prefer the upstream solution because it composes. Maintaining the conditions that produce endogenous melatonin also lowers cortisol, supports liver detox pathways, and improves my recovery the next day. The pill solves one variable in isolation. The conditions solve seven, by accident.

That distinction is the entire mental model I apply to PrimalBasics formulations. And it's most visible in PrimalDent.

The toothpaste version

Tooth enamel demineralizes and remineralizes constantly. The mineral source for remineralization is your saliva, which at neutral pH is naturally supersaturated with calcium and phosphate ions. It deposits those minerals back onto enamel as biological apatite — the same crystal lattice your teeth are made of — every time the chemistry is right. The chemistry is right when oral pH stays above about 5.5. Below that, the math reverses and enamel dissolves.

The cavity-causing organism Streptococcus mutans drops oral pH below 5.5 by fermenting sugar into lactic acid. That's the entire game. Cavities are a pH problem and a microbial problem, and the body's own remineralization system handles the rest — if the conditions allow.

The dominant new active ingredient in clean-beauty oral care is hydroxyapatite. It is the melatonin pill of toothpaste. Synthesized nano-particles of bioidentical mineral — the same stuff your enamel is made of — applied directly to the tooth surface. It works. It's well-studied. The 2024 Journal of Dentistry systematic review confirms it, and I'm not going to pretend otherwise.

PrimalDent doesn't use it.

Conditions over ingredients

PrimalDent is four ingredients: sodium bicarbonate, ceylon cinnamon, bentonite clay, peppermint essential oil. Each one performs an upstream job:

• Sodium bicarbonate raises oral pH after acid attacks. The saliva equilibrium shifts back to deposition.
• Ceylon cinnamon suppresses S. mutans. Less acid produced means less pH drop to recover from.
• Bentonite clay cleans plaque mechanically without abrading enamel, in an alkaline carrier.
• Peppermint is secondary antimicrobial and the sensory layer that makes the whole thing usable twice a day.

The remineralization itself is performed by your saliva. PrimalDent's job is to keep the conditions in which your saliva does what it already knows how to do. Same logic as the sleep stack: provide inputs, optimize environment, remove blockers, let the system run.

The HAp evaluation that produced our white paper

I want to be transparent about how this position got tested.

Through 2025 and into early 2026, hydroxyapatite became the dominant active across clean-beauty oral care. Boka, Davids, Apagard, Risewell, Theodent, and a growing list of smaller brands all lead with it. Customer demand is real. The science is real. We owed our own customers — and our own standard — a serious evaluation.

Late last year we identified a Japanese supplier producing pharmaceutical-grade HAp from recycled eggshells. On first read it looked like a near-perfect fit: a food-industry waste stream, clean documentation, philosophical alignment with a natural source. We started formulation discussions for a reformulated PrimalDent that would have included it.

The processing audit is what walked us back. Eggshell-derived HAp, in finished form, is the result of high-temperature calcination of the shells (typically 800–1000°C, converting calcium carbonate to calcium oxide), wet-precipitation reaction with a synthesized phosphate source, sintering to crystallize the apatite structure, and milling to nano-scale particle distribution. By the time the powder ships, it is chemically identical to hydroxyapatite synthesized from any other calcium source. The eggshell origin is real but functionally irrelevant. The 0% Standard treats processing as the load-bearing question — what was done to an ingredient before it touched the user — and on that question the eggshell-derived material did not qualify.

We walked.

What this is, and what it isn't

This isn't an argument that hydroxyapatite doesn't work. It does, and the brands using it have a defensible scientific basis for their claim. It's an argument that conditions matter at least as much as ingredients, and that the human body already contains the most sophisticated mineral delivery system anyone has yet engineered. Our bet is that supporting that system produces a different — and, for the right user, better — outcome than supplementing past it.

The full case is in the white paper we just published: Conditions Over Ingredients: A Mechanistic Case for Upstream Prevention in Oral Care. It's twelve pages, fully cited, and engages honestly with the HAp evidence base. If you've ever wondered why PrimalDent has four ingredients and most toothpastes have twenty, that's the document.

Same logic that keeps me off melatonin keeps PrimalDent off HAp. Provide the inputs. Optimize the environment. Remove the blockers.

Then trust your body to do what it already knows how to do.

— Mike