In a nutshell: Hair loss in men usually has one of three causes: hereditary androgenetic alopecia, stress-related telogen effluvium, or a nutrient deficiency. Zinc and biotin are the only nutrients with an EFSA-authorized claim for the maintenance of normal hair. In the case of sudden, diffuse, or circular hair loss, the first point of contact should always be a GP or dermatologist, not the supplement shelf.
TL;DR
How common is hair loss in men really?
Hair loss is one of the most common concerns for which men visit a dermatologist. Estimates in dermatological literature suggest that the vast majority of men develop some form of hair loss during their lifetime, with androgenetic alopecia – colloquially known as "hereditary" hair loss – being by far the most frequent cause. However, this does not mean that every thinning hairline is automatically genetic and irreversible. Before you worry about supplements, it is worth taking a sober look at what type of hair loss you actually have – because the causes, and thus what actually helps, differ significantly.
The most common causes of hair loss in men
Androgenetic Alopecia (Hereditary Hair Loss)
This form primarily affects the scalp at the temples, the crown, and the parting, progressing gradually over years. The cause is a genetically determined sensitivity of the hair follicles to dihydrotestosterone (DHT), a breakdown product of testosterone. The follicles increasingly shorten their growth cycle until, eventually, only fine, barely visible vellus hairs grow back. This form of hair loss cannot be stopped or reversed by nutrients – a point that unscrupulous supplement providers often omit. Medically recognized treatment approaches include active ingredients such as minoxidil or finasteride, which require a prescription or are pharmacy-only and should be medically supervised.
Telogen Effluvium (reactive, usually temporary hair loss)
Unlike androgenetic alopecia, telogen effluvium affects the entire scalp evenly and typically occurs two to four months after a triggering event: severe stress, a febrile infection, surgery, drastic weight loss, pregnancy, or a nutrient deficiency. The body sends an unusually large proportion of hair follicles into the resting phase (telogen) simultaneously, which manifests as diffuse, often alarming hair loss over several weeks. The good news: in most cases, this process is reversible once the underlying trigger is resolved.
Nutrient deficiencies as an independent or aggravating cause
A genuine nutrient deficiency is less often the sole cause of hair loss in men compared to women, but it does occur – particularly with a very restrictive diet, high athletic activity without sufficient caloric intake, chronic intestinal diseases that impair nutrient absorption, or certain diets. Most commonly associated with hair loss are iron deficiency, zinc deficiency, biotin deficiency, and low vitamin D levels. Important for classification: a deficiency can exacerbate pre-existing, e.g., hereditary, hair loss without being the primary cause. This is why supplements often only provide partial help in such cases.
Other possible causes
Thyroid dysfunctions (both hyper- and hypothyroidism), certain medications, scalp conditions such as seborrheic dermatitis or fungal infections, and the autoimmune disease alopecia areata (circular hair loss) can also be triggers. These causes cannot be treated with supplements and require medical diagnosis. Certain drug groups – such as some blood pressure medications (beta-blockers), antidepressants, blood thinners, or high-dose retinoids – are also suspected of causing hair loss as a side effect. Anyone who has recently started a new long-term medication and notices increased hair loss should discuss this with the prescribing physician rather than discontinuing the medication on their own.
Important Note
Which nutrients are actually relevant for hair growth?
There are two nutrients with a health claim officially reviewed and approved by the European Food Safety Authority (EFSA) that specifically refer to the maintenance of normal hair: zinc and biotin. This does not mean that additional intake leads to more or thicker hair if you are already sufficiently supplied – the claim refers to maintaining the normal state, not an increase. For other frequently advertised substances like collagen or individual amino acids, there is no EFSA-authorized claim specifically related to hair; however, they can still be useful in a balanced supply through their role as protein building blocks.
Hivi Mahmoud, Payman M. Saifdeen, and their team at Azadi Teaching Hospital in Duhok (Kurdistan region, Iraq) compared 125 people with hair loss with 75 control subjects in a case-control study and found zinc deficiency significantly more frequently in those affected – most pronounced in the group with telogen effluvium.
→ Source: Mahmoud, Saifdeen, Al-Timimi, Saeed, Zinc Status in Kurdish Adults With Hair Loss, Cureus (2024)
| Nutrient | Role according to EFSA / Study Situation | Reference Value (NRV) for Adults | Practical Classification |
|---|---|---|---|
| Zinc | EFSA-authorized claim: contributes to the maintenance of normal hair | 10 mg/day | Useful if a deficiency is proven; avoid overdose (observe upper limit) |
| Biotin | EFSA-authorized claim: contributes to the maintenance of normal hair | 50 µg/day | A genuine deficiency is rare; usually no additional benefit with a sufficient diet |
| Iron | Iron deficiency is linked to telogen effluvium in studies | 14 mg/day | Only dose if justified by blood test; overdose is risky |
| Vitamin D | Low levels are found more frequently in hair loss patients in observational studies | 20 µg/day (800 I.U.) | Association, not proven causation |
| Collagen / Amino acids | No EFSA-authorized claim for hair; provides protein building blocks like L-lysine and proline | No official NRV | Useful as part of protein intake, not to be understood as a targeted hair remedy |
NRV = Nutrient Reference Value for adults according to EU Food Information Regulation (Regulation (EU) No 1169/2011, Annex XIII). Values apply to an average adult and do not replace individual requirement assessment.
What the study situation really shows about supplements for hair loss
Scientific evidence regarding nutrients and hair loss is significantly less uniform than advertising promises suggest. While a regulatory-recognized connection for the "maintenance" of normal hair exists for zinc and biotin, this is different from proof that additional intake leads to noticeably more hair growth in already well-supplied men. Japanese dermatologist Tadashi Karashima and his team at Kurume University School of Medicine treated five patients with zinc-deficiency-related telogen effluvium with oral zinc (polaprezinc) – in all patients, the hair loss improved or healed, which supports a causal link for a proven deficiency, albeit with a very small sample size.
Shayan Zufishan, Zeba Haque, and their team at Dow University of Health Sciences in Karachi investigated the role of zinc in serum and hair of patients with chronic telogen effluvium in another case-control study and confirmed the link between low zinc levels and this form of hair loss.
For iron, the study situation is somewhat clearer in one direction: multiple observational studies find lower ferritin levels (the storage form of iron) in people with telogen effluvium compared to those without hair loss – however, this is an association, not proof that iron supplementation automatically helps every affected individual. Also important: these studies were predominantly conducted on women, in whom iron deficiency is much more common than in men. Transferability to men is therefore limited.
For vitamin D, there is a recurring finding of lower serum levels in people with various forms of hair loss, including androgenetic alopecia and alopecia areata. Here too, the same applies: a lower level in those affected does not prove that raising the level stops hair loss – it could be that both are independently related to other factors like diet, season, or general health. Reputable statements therefore remain cautiously formulated: "is associated with," not "fixes" or "cures."
Classification
Myth "Creatine causes hair loss" – a brief classification
A frequently cited study "proof" for "creatine causes hair loss" is a small study among rugby players that showed an increase in DHT levels while taking creatine – without actually measuring actual hair loss. You can find further details on the study situation, dosage, and tolerability of creatine in our separate article on creatine side effects. This article here intentionally covers the general causes of hair loss and the nutrient context independently of creatine, because the two questions address different target groups and search intents.
Sport, calorie deficit, and hair loss: an underestimated connection in active men
A connection often overlooked in public discussion concerns very physically active men in a calorie deficit – for example, during a diet phase before a competition or during intense endurance training combined with low energy intake. A persistent, significant calorie deficit signals stress and lack to the body, which it can react to by diverting resources from "non-vital" processes like hair growth and focusing instead on vital functions. A few weeks after starting a very strict diet, this can lead to a classic telogen effluvium, which usually subsides again with more moderate calorie intake and sufficient protein supply. Chronic overtraining without sufficient recovery can also promote a similar effect via increased cortisol levels. For men who use creatine, whey protein, or pre-workout products in parallel: in these cases, it is not the supplement that is the cause, but the underlying energy deficit or training stress.
Hair care from the outside versus nutrient supply from the inside
Shampoos, serums, and scalp massages can nourish the scalp, reduce dandruff, and improve the subjective appearance of hair, but they act exclusively on the surface. The hair follicle itself is supplied via blood vessels – which means that the nutrient supply from the inside (via diet and, if necessary, targeted supplementation) is more decisive for the actual growth of new, healthy hair than external care products. Both levels are not mutually exclusive, but should not be confused with each other: a high-quality shampoo does not fix an iron deficiency, and a food supplement does not replace scalp care for inflammatory skin diseases.
Overview of suitable VEYT products
The following products are useful if there is a corresponding deficiency or if the general nutrient supply is to be supplemented – they do not replace medical diagnosis and are not a remedy for hereditary hair loss.
Practical Tip
Biotin High-Dose Complex
According to the EFSA, biotin contributes to the maintenance of normal hair – useful if a deficiency is confirmed.
Zinc High-Potency Shield
Highly bioavailable zinc bisglycinate with 25 mg per tablet, dosable according to individual needs.
Eternal Collagen Peptides
Provides amino acids as protein building blocks – as a supplement to total protein intake; not a targeted hair treatment.
Pure L-Lysine Complex
L-lysine is an essential amino acid that the body cannot produce itself and must obtain through diet or targeted supplementation.
Practical Roadmap: What you can do when hair loss begins
1. Observe and assess. Note when you first noticed the hair loss, whether it is diffuse or localized (e.g., receding hairline), and if there is a temporal connection to stress, illness, diet, or medication use.
2. Lab diagnostics before supplementation. A general practitioner can use a blood test including ferritin, TSH (thyroid), vitamin D, and zinc to check if a deficiency actually exists. This is the only way to dose meaningfully, rather than taking high-dose supplements "on suspicion."
3. Diet as the foundation. Sufficient protein intake, regular consumption of foods containing zinc and iron (e.g., whole grains, legumes, lean meat), and an overall varied diet are the basis – regardless of whether you take additional supplements.
4. Targeted supplementation for confirmed deficiencies. If a zinc, biotin, iron, or vitamin D deficiency is confirmed, targeted supplementation can be useful. Pay attention to reputable dosages within the official reference values and avoid uncontrolled mega-doses.
5. Plan for patience. The hair cycle is slow. Even with a correctly treated deficiency, it usually takes three to six months before visible improvements are noticeable, because new hair must first regrow.
6. For persistent or severe hair loss: medical evaluation. If nothing changes after a few months, the hair loss progresses, or signs of androgenetic alopecia are visible, a dermatological examination is the next sensible step.
Measure progress objectively instead of judging by feeling
Because the hair cycle is slow and daily perception in the mirror fluctuates significantly, many men overestimate both the speed of their hair loss and the success of a measure. A simple, objective approach helps to distinguish real changes from normal fluctuations: Take a photo of the top of your head and your receding hairline every four weeks with the same lighting and head position, ideally immediately after washing your hair. Additionally, you can roughly count or weigh the hair that falls out during washing over two to three days to get a rough baseline – day-to-day fluctuations of 30 to 50 percent are completely normal and no cause for concern. This method does not replace a dermatological examination such as a trichogram, but it provides you with an honest foundation to judge whether a measure – whether supplementation, dietary change, or medical treatment – is actually working before you prematurely stop it or continue it for unnecessarily long.
When you should go directly to the doctor
Certain signs should not be "tested" with supplements, but rather cleared up by a doctor promptly: sudden, clumped hair loss, circular bald spots, hair loss accompanied by skin changes, itching or pain on the scalp, as well as hair loss along with other symptoms such as unintentional weight changes, severe fatigue, or palpitations (possible signs of thyroid issues). In none of these cases does supplementation replace medical diagnostics.
Expert Perspectives & Protocol Breakdown
Internationally renowned health experts have varying opinions on the topic of hair loss and nutrients. Below, we categorize three relevant voices and compare them with the actual state of research – chosen deliberately because their approaches to nutrient deficiencies and hair loss differ noticeably.
Dr. Eric Berg
What he recommends: Chiropractor and health content creator Dr. Eric Berg regularly addresses hair loss in his content in the context of nutrient deficiencies, primarily mentioning zinc, biotin, and iron, as well as possible thyroid involvement. His general approach: When a deficiency is suspected, supplement in a targeted manner relatively quickly.
→ Source: drberg.com
Dr. Mark Hyman
What he recommends: Functional medicine practitioner Dr. Mark Hyman usually classifies hair loss as a symptom of an overarching systemic imbalance – such as gut health, chronic inflammation, thyroid function, or blood sugar. He generally recommends comprehensive lab diagnostics (ferritin, thyroid values, vitamin D) before targeted supplementation, rather than starting directly with a fixed supplement stack.
→ Source: drhyman.com
Dr. Rhonda Patrick
What she recommends: Biomedical scientist Dr. Rhonda Patrick consistently argues based on primary literature. Regarding micronutrients and hair, she regularly emphasizes that a proven benefit exists primarily when a deficiency has been demonstrated, explicitly warns against mega-doses of accumulating nutrients like iron, and makes it clear that supplementation beyond requirements has not shown any additional hair growth effect.
→ Source: foundmyfitness.com
Where They Differ
Berg tends toward a more pragmatic "supplement quickly if suspected" approach, Hyman insists on laboratory confirmation before any targeted intake, and Patrick is the most conservative of the three: she repeatedly emphasizes that the evidence primarily concerns proven deficiencies, not blanket intake. However, all three agree on one point: none of them claims these nutrients will stop hereditary hair loss (androgenetic alopecia).
What the Evidence Says
The studies cited in this article align with the more cautious assessment: For zinc and biotin, an EFSA-authorized claim exists regarding the "maintenance" of normal hair given sufficient supply – no evidence of additional benefit for individuals who are already normally supplied. Karashima’s small case series and the work of Mahmoud/Saifdeen as well as Zufishan/Haque support an effect specifically in cases of proven zinc deficiency. For iron and vitamin D, predominantly association studies are available, not clear proof of causality. Expert opinion here provides primarily hypotheses and practical experience, not a replacement for the primary literature summarized in this article.
Frequently asked questions about hair loss in men
At what point is hair loss considered to require treatment?
A loss of an average of up to 100 hairs per day is considered normal, as the hair cycle is constantly renewing itself. Significantly higher loss that persists over weeks or noticeably thinning hair is a reason for clarification.
Does biotin help with hereditary hair loss?
No. According to the EFSA, biotin contributes to the maintenance of normal hair, but it cannot stop the miniaturization of hair follicles triggered by DHT in cases of androgenetic alopecia.
How long does it take for nutritional supplements to work in the event of a deficiency?
First visible effects are to be expected after eight to twelve weeks at the earliest, as new hair must first regrow. A realistic assessment often requires three to six months.
Can too much zinc or biotin be harmful?
Yes. Permanent overdosage of zinc can disrupt the copper balance and impair the immune system. Very high doses of biotin can also falsify certain laboratory values (e.g., thyroid or heart values), which should absolutely be disclosed during doctor visits.
Is hair loss in men always hereditary?
No. Although hereditary hair loss is the most common cause, telogen effluvium, nutrient deficiencies, thyroid problems, and scalp diseases can also be responsible – often in combination.
Which foods provide high amounts of zinc and iron?
Zinc-rich foods include pumpkin seeds, oatmeal, beef, and legumes. Iron is found in significant quantities in lean meat, lentils, chickpeas, and leafy green vegetables, where absorption from plant-based sources can be improved by vitamin C.
Does collagen work against hair loss?
There is no EFSA-authorized claim for collagen specifically regarding hair. However, it provides amino acids such as L-lysine and proline, which can be part of a balanced supply as protein building blocks without being considered a targeted treatment for hair loss.
Should I take multiple high-dose nutrients at the same time to be safe?
We explicitly advise against this. An uncontrolled combination of high-dose preparations increases the risk of interactions and overdosages without accelerating success, as the body either excretes excess amounts or – in the case of zinc and iron – stores them in a potentially harmful way. Targeted rather than blanket supplementation is the more sensible strategy here.
Does intensive training increase hair loss?
Training itself does not, but a persistent calorie deficit or chronic overtraining without sufficient recovery can promote telogen effluvium through stress hormones and energy deficiency. Sufficient calorie and protein intake counteracts this.
Is hair loss in young men (under 25) unusual?
No, androgenetic alopecia can begin in the early twenties. An early start is no reason for panic, but it is a good time to seek dermatological advice, as early treatment can improve the prospects of success.
Conclusion
References & Scientific Citations
- Regulation (EU) No 432/2012 of the European Commission, List of authorized health claims (Zinc and biotin: maintenance of normal hair). EUR-Lex 32012R0432
- Karashima, T. et al. (2012). Oral Zinc Therapy for Zinc Deficiency-Related Telogen Effluvium, Dermatologic Therapy
- Mahmoud, H., Saifdeen, P.M., Al-Timimi, D., Saeed, S.A. (2024). Zinc Status in Kurdish Adults With Hair Loss, Cureus
- Zufishan, S., Haque, Z., Nazar, S., Afaq, E., Aamir, E., Rafique, S. (2024). Role of Zinc in Chronic Telogen Effluvium in Serum and Hair of Patients with Alopecia, Journal of the Pakistan Medical Association
- German Nutrition Society (DGE), Reference value for zinc (Ø 14 mg/day for men, phytate-dependent) — dge.de/wissenschaft/referenzwerte/zink
- Dr. Eric Berg — drberg.com
- Dr. Mark Hyman — drhyman.com
- Dr. Rhonda Patrick — foundmyfitness.com
Passend dazu
Zinc Bisglycinate 25 mg – 500 Tablets
