I had been taking NMN for half a year, but my face actually became more sunken and looked older.
The first reaction was to criticize NMN.
The answer is: NMN is highly unlikely to be responsible for this, but you have raised a more profound question - why does the face start to collapse from the bone layer?
Those "anti-aging molecules" taken orally - do they really have any effect on the bones?
This is the last and the most easily overlooked aspect among the four phases, and it is also the one that the skincare industry tends to pretend is invisible: bone structure.
The epidermis layer is about the barrier, the dermis layer is about the collagen network, and the adipose layer is about the atrophy and displacement of the fat pads.
And the concept of bone structure refers to the foundation - the entire three-dimensional supporting structure of the face, which is attached to the skull and facial bones framework.
The skeleton has shrunk. No matter how good the skin, dermis, and fat are, they are still attached to a sinking foundation.
At home, through oral administration and external application, you can do certain things and avoid doing others regarding bone health.
facial bones do actually shrink
Many people think that aging is just a matter of the skin becoming loose and the flesh sagging.
On a deeper level, the cranial bones themselves undergo volumetric absorption (bone resorption) as a function of age, and this process follows clear anatomical patterns:
The eye sockets are expanding - the bone at the upper inner and lower outer rim of the eye socket is absorbing, making the eye socket appear deeper and emptier.
This is the bony cause of "aging in the eyes".
The maxilla (the base of the mid-face) retracts and sinks backward - the pear-shaped opening (the bone window around the nostril) expands with age, and the support of the nasal base is lost.
This is the underlying reason for the increasingly deep nasolabial folds and the inability to smooth out the nasolabial groove as one ages.
I thought it was the fat pad that had fallen off, but in fact, the bone surface beneath the fat pad had collapsed first.
The mandible is shrinking - the mandibular angle becomes blunt, the mandibular ramus becomes shorter, and the chin retracts backward.
As a result, the lower facial contour becomes loose and the "sagging" effect intensifies.
These are not fabricated marketing slogans.
They are the research conclusions of decades of CT morphological studies in maxillofacial surgery and imaging medicine.
The essence of bone aging is that bone formation (bone creation) cannot keep up with bone resorption (bone dismantling).
Why do bones become unbalanced: From RANKL to NAD+
Bone tissue is constantly in a state of "removal and reconstruction, reconstruction and removal" - this dynamic balance is called bone remodeling (bone remodeling), and it is carried out by two types of cells that play opposing roles:
Osteoblast: The construction team for bone formation.
Osteoclast: The demolition team for bones.
The core signaling axis that commands these two teams is called RANKL / RANK / OPG:
RANKL is like a "destruction order".
The more of it there is, the more osteoclasts are activated and the more extensive the destruction becomes.
OPG is an "interception molecule" that blocks RANKL, thereby suppressing the activity of osteoclasts.
After menopause, women's bones tend to weaken and collapse much more rapidly. The reason for this lies here:
Estrogen was originally supposed to suppress RANKL and protect bone mass.
Once estrogen levels plummet, RANKL becomes out of control, and osteoclasts overpower osteoblasts, causing a rapid loss of bone mass.
This is why facial aging is most pronounced in women over 40, especially those over 50.
How do NAD+ and NMN get in?
NAD+ (nicotinamide adenine dinucleotide) is the "energy currency and signaling molecule" within cells.
It serves as the fuel for a large group of anti-aging enzymes - the silent information regulator factors SIRT (particularly SIRT1).
SIRT1 does two things directly related to bones:
Deacetylation and activation of osteogenic-related pathways (such as Runx2, PGC-1α) help osteoblasts perform their functions;
Inhibiting the main inflammatory pathway NF-κB, which is the upstream driver that triggers RANKL and promotes osteoclast formation.
The level of NAD+ decreases sharply with age (this is also the core mechanism assumption in the section on bone structure in my thesis).
So the logical chain is valid: supplementing the NAD+ precursor (NMN/NR), theoretically it can tip the balance in favor of bone remodeling.
But - note this but - "theoretical experts" and "clinical evidence that it can reverse facial bone age", there is a huge gap between these two.
complete spectrum of home-based intervention: molecular correctors + nutrients + household physical energy
NAD+ precursor family - "master switch" for molecular correction
The sole aim of this type of treatment is to restore the plummeting NAD+ levels within the cells and provide fuel for SIRT1.
But the same name but different identities - and here there is a biochemical cognitive error that almost all "anti-aging science" discussions tend to overlook. I must clarify this.
Let me present an unexpected truth: Nicotinamide (NAM) is not the "optimal solution", and it might even be a trap.
Many science popularization materials recommend NAM, citing the reasons that it follows the "remedial synthesis pathway, has the shortest path and is the least wasteful".
This is fifty-fifty.
From an enzymology perspective, NAM first needs to be catalyzed by the rate-limiting enzyme NAMPT to generate NMN, and then converted into NAD+.
As people age, the activity of NAMPT in the human body significantly decreases, and the conversion efficiency of NAM will be blocked at the bottleneck.
The concept of "the shortest path" does not hold true.
And the most dangerous aspect is negative feedback inhibition: After SIRT1 consumes NAD+, the by-product produced is precisely NAM.
If a large amount of NAM is taken orally and it accumulates within the cells, it will, in turn, directly inhibit the activity of SIRT1.
The purpose of NAD+ is precisely to serve as fuel for SIRT1.
Supplementing NAM while inhibiting SIRT1 is logically contradictory.
So the sentence "If I keep only myself as NAM" is one that I must retract.
NMN/NR - The most renowned, but with a smoother mechanism and stronger evidence.
NMN can be directly converted into NAD+ in one step, without being hindered by the rate-limiting effect of NAMPT.
NR also takes a shorter path.
Both of them can effectively increase intracellular NAD+, providing energy for SIRT1 and suppressing the osteoclast formation driven by NF-κB.
But to be clear: Currently, there are almost no high-quality RCTs on NMN/NR for facial bones.
The evidence mostly comes from animal models, systemic aging, and muscle/metabolic endpoints.
Compliant raw materials and dosages: 250-1000mg per day.
Taking them on an empty stomach in the morning is more in line with the circadian rhythm.
Key supplement: TMG (Trimethylglycine) - The overlooked "methyl donor".
Here is a pitfall that only high-end solutions would pay attention to: Increasing NAD+ metabolism will consume a large amount of the body's methyl pool.
When the methyl pool is exhausted, it can cause fatigue, elevated homocysteine levels, and even abnormal gene expression.
TMG is responsible for replenishing the consumed methyl groups.
When combined with NMN/NR in a ratio of approximately 1:1 (each 500-1000mg per day), it is a standard component of the longevity medical regimen.
Only supplementing NAD+ without supplementing TMG is equivalent to just stepping on the accelerator without actually adding fuel.
Periodize instead of constantly arguing:
The NAD+ precursor cannot be applied blindly in full.
It is recommended to "eat for 5 days and stop for 2 days" (for example, eating on weekdays and stopping on weekends), which not only prevents receptor desensitization but also mimics the natural rhythm fluctuations of the human body.
The customer who felt that the NMN had "buried" her face, the problem was not that NMN was harmful, but that she regarded it as the only solution, and it couldn't reverse the bone loss that had already occurred - the "collapse" she felt was the continuous aging of the bones.
NMN could only slow it down, it couldn't restore the lost bone volume.
If she only takes NAM without taking TMG, then "feeling tired and having poor condition" would be a more likely actual problem.
From "Functional Nutrition" to "Longevity Medicine" - Advanced Ingredients for Bone Matrix and Cellular Youthfulness
Is it sufficient to have only the "start signal" (NAD+) and "building materials" (minerals)?
If the goal is to truly combat aging through bone structure, it is not enough.
Why does bone resorption become out of control?
Because within the bone tissue, there is a group of "old workers" - senescent cells (which continuously secrete inflammatory factors, such as IL-6 and TNF-α).
These factors are the source that activates RANKL and triggers bone resorption.
And the "engine" of osteoblasts (mitochondria) is also aging and its autophagy ability is declining.
From bone matrix replenishment to intervention for cellular rejuvenation - this represents a fundamental watershed in the field of international cutting-edge anti-aging (Longevity Medicine) and home care products.
40+ especially needs to reach this level.
Four mechanism dimensions, each providing actionable molecules and rhythms:
① Aging cell clearance agents (Senolytics)
Cutting off the "source" of inflammation.
Fisetin and Quercetin, which are currently very popular in clinical research as plant flavonoids, can "target and eliminate" the accumulated aging cells in the body, cutting off the damage caused by SASP to bone remodeling at its source.
The key point is that one should not eat every day - during tissue repair, there will also be a brief appearance of aging-like phenotypes.
Continuously eliminating them would mistakenly harm the normal healing process.
Following the "Hit-and-Run" pulse therapy method of the Mayo Clinic: Take 1500-2000mg of Nisultamid daily.
Consume for only 2-3 consecutive days each month, and discontinue for the rest of the time.
This is a reductionist approach to counteract the imbalance of bone remodeling.
② Epigenetics and dual effects on bone matrix:
Calcium-α-ketoglutarate (Ca-AKG) is a molecule that has gained even more attention in recent years, surpassing NMN in popularity.
AKG is a necessary precursor for collagen synthesis and is also a core cofactor of the TET enzyme (responsible for DNA demethylation and reversing epigenetic age).
In the form of "calcium", it has a higher absorption rate than calcium carbonate and is less likely to deposit in blood vessels.
It precisely serves as a bridge connecting "energy metabolism" and "bone matrix construction".
Dosage: 1000 - 2000 mg per day, taken with meals to delay absorption;
After consecutive administration for 3 to 6 months, a 2 to 4 week wash-out period is scheduled to allow the endogenous metabolic pathways to reset themselves.
③ Autophagy of cells and mitochondrial rejuvenation:
Urolithin A and spermidine are not the only factors influencing bone health; it also depends on whether the internal engines of these cells are youthful.
Urolithin A effectively induces mitochondrial autophagy (mitophagy), removing damaged mitochondria within osteoblasts.
The latest research shows that it can simultaneously improve the metabolic efficiency of both skeletal muscle and bone tissue - effectively controlling both "muscle aspect" and "bone aspect".
Spermidine is a potent autophagy inducer. The reduced autophagy ability of bone cells is a key factor in age-related bone loss.
Supplementing with spermidine is equivalent to conducting a "deep cleaning" for osteoblasts.
Urolithin A 500-1000mg per day: For the first 8-12 weeks, take 1000mg as an induction period, then reduce to 500mg for maintenance or take it 3-4 times a week.
④ Intervertebral bone axis (Osteomicrobiology)
The next-generation covert warfare line: Specific probiotics (such as Lactobacillus rhamnosus GG, AKK bacteria) regulate the systemic Treg immunity by producing short-chain fatty acids (SCFA), thereby indirectly inhibiting the activity of osteoclasts.
Improving the intestinal microecology is becoming a new frontier in the fight against bone loss.
Domestic physical energy - cutting-edge, but don't mythologize it
Home-use LIPUS (Low Intensity Pulsed Ultrasound):
LIPUS promotes bone healing, and there is evidence for this in the field of fracture treatment (the FDA has approved its use for fracture healing).
But if we extend this to "anti-aging of facial bones", it is currently a cutting-edge research topic with a reasonable mechanism but insufficient direct evidence.
The energy of household equipment is low, and it can only provide low-frequency and long-term assistance. Don't expect it to be able to reverse anything on its own.
Household NIR-LED red light (near-infrared):
Near-infrared radiation enhances mitochondrial function and may assist in bone metabolism. This is also a stage where "the direction is correct and the evidence is early".
When maintenance methods are available, but the main force is not.
NMN cannot reverse chronological age, but concept of "delaying" itself has value.
This model does not claim that oral or topical products can directly reverse the already occurring facial bone resorption.
Its scientific objective may merely be to slow down the rate of bone loss.
This statement may seem "cowardly", but in fact, it represents the only honest stance of the "bones" aspect.
Distinguish between two things:
"Reversal" = To restore the bone volume that has been absorbed. Home-based methods cannot achieve this.
Who told you that taking a pill could make your bones grow back? You can simply call it a waste of money for your brain.
"Delay" = Make the osteoclasts not break down so quickly, and shift the balance a little towards the osteoblasts.
This is the real and achievable goal of home-based intervention.
Is delaying meaningful? Yes, it is.
Osteogenesis is the slowest and most irreversible phase among the four phases - precisely because it is slow and irreversible, the earlier it is initiated, the greater the accumulated gap over several decades.
Starting from the age of 20, one began to focus on providing NAD+ energy, replenishing bone matrix, and promoting cellular rejuvenation.
They developed the habit of maintaining a regular rhythm.
In contrast, at the age of 50, one suddenly realized the importance and made haphazard and excessive supplementation.
These are two completely different approaches.