What are the best supplements for men testosterone in the UK?

The report a man would actually receive: five lines, how each is sampled and read, and what each line is telling him before any supplement is considered

What are the best supplements for men's testosterone in the UK is a question that the shelf answers before a man has seen a number, and the honest answer reverses the order, because a testosterone result is a laboratory report with five lines and every product sold for the hormone is a claim about one of them that the report can check. The first line is total testosterone, the hormone in the blood whether bound or free, and the way it is sampled decides whether it means anything: between about seven and eleven in the morning, when the hormone peaks, on two separate days, fasted, because readings in the same man vary by about a fifth between days and fall through the afternoon by as much again, so that a single afternoon reading is the rhythm rather than a result and a man who has been told his testosterone is low on one such sample has been told the time of day. The second line is sex hormone binding globulin, the protein that carries most of the total and releases little of it, which rises with age, with low body weight and with thyroid excess and falls with body fat and with insulin resistance, and which decides how much of the total is doing anything. The third line is free testosterone, or the calculated free fraction, the two or three per cent of the total that is unbound and active, which is the line that symptoms track and the line a high total with a high binding globulin can hide a low value in. The fourth line is luteinising hormone, the pituitary's signal to the testes, which tells the doctor whether a low total is the testes failing to respond to a high signal or the pituitary failing to send one, two different diagnoses with different causes and treatments. The fifth is the reference range the laboratory prints beside each line, which differs between laboratories and assays and against which every other line is read, so that a man comparing his total with a number from a forum has compared it with a different ruler.

Read as five lines, a report tells a man where he actually stands before he has considered a product, and most men who read it find the total in range, the free fraction in range and the binding globulin where their body fat put it, which is a report that sends them back to the levers rather than to the shelf; a report with the total below range on both mornings, with symptoms, is a different document, which the next section reaches.

Every supplement as a claim about one line: zinc, vitamin D, the boosters, and the three levers that move the lines further than any of them; the report that is a diagnosis; the worked example; and the verdict

With the five lines in view, every supplement sold for testosterone is a claim about one of them, and the report can check the claim. Zinc is a claim about the total in a man who is deficient: the register permits the statement that zinc contributes to the maintenance of normal testosterone levels in the blood, which describes a deficient man returning to a normal total at the 10mg reference value and not a replete man rising above it, and most men eating meat, dairy and eggs are replete, so zinc moves the total only when a second test or a restricted diet shows the shortfall. Vitamin D is the same claim with thinner evidence: one small trial in overweight men with low vitamin D reported a higher total after a year of supplementation, and the later randomised trials in men who were not deficient found no change, which is the signature of a deficiency correction and puts vitamin D on a man's list for the winter and his bones with the total as a possible bonus in the deficient. The boosters are a claim about the total that the 2020 audit of fifty top-selling products could find almost no data for, under a quarter with any published increase, none with a trial on muscle, and several with vitamins above tolerable upper levels, so that they are a claim the report cannot confirm because the products never generated the numbers. Three levers move the lines further than any of them and are read off the report itself. Body fat moves the second and third lines in the wrong direction, lowering the binding globulin while raising the conversion of testosterone to oestrogen in fat tissue, so that a man carrying more fat than he trains with has a lower free fraction for it; losing the fat is the intervention that moves two lines at once. Sleep moves the first line, with a week of five-hour nights cutting a young man's daytime total by 10 to 15 per cent in the restriction study and the loss reversing with the sleep. Alcohol moves the clearance and is directly toxic to the testes, visible in a Monday sample after a weekend. And resistance training supports a higher resting total across a training life while building the muscle the hormone is wanted for. The report that is a diagnosis is the one with the total below the reference range on both morning samples, with symptoms, fatigue, low libido, lost strength, low mood or erectile difficulty, and that report belongs to the doctor who ordered it, because it describes a condition with its own causes read from the luteinising hormone line and its own treatments, none of which is on a shelf, and because a man who treats it with a tub has treated a diagnosis with a footnote.

The worked example is not on the report and does not claim to be: {FL}, 1500mg magnesium bisglycinate stated as 300mg elemental at 80% NRV, two capsules with the evening meal, carrying the authorised claims for normal muscle function, normal protein synthesis, normal nervous system function and the reduction of tiredness and fatigue, and no claim about testosterone, since the small trials on the hormone are in deficient men and have produced none, batch tested for lead, mercury, arsenic and cadmium with the certificate on request, UK made under GMP and BRC, 180 capsules for £19.99 at 22p a day, taken because the national diet survey finds young men short of the mineral and not for any line on the report. The verdict on the best supplements for men's testosterone in the UK is that the report comes before the shelf: five lines, sampled on two mornings and read against the laboratory's own range, on which zinc and vitamin D move the total only in the deficient, the boosters move nothing the audit could find, and body fat, sleep and alcohol move the lines further than any product; and that a total below range on both mornings with symptoms is a diagnosis for the doctor who ordered the report, which is the one place on this page where a man's testosterone is actually treated.

What to check on the label

Questions people also ask

What is the best supplement to increase testosterone for men?

None that a replete man's laboratory report can confirm: zinc's register claim is for the maintenance of normal levels, describing a deficient man returning to normal at the 10mg reference value, vitamin D raised the total in one small trial of men with low vitamin D and in none of the later trials in replete men, and the 2020 audit of fifty top-selling boosters found under a quarter with any published increase and none with a trial on muscle; the levers that move the report's lines are body fat, which lowers the binding globulin and raises conversion to oestrogen, sleep, which cuts the total by a tenth or more on five-hour nights, alcohol and resistance training, and a total below range on both mornings with symptoms is a diagnosis for the doctor who ordered the test.

How is testosterone tested properly?

As a report of five lines rather than one number: total testosterone sampled between about seven and eleven in the morning on two separate days, fasted, because the hormone peaks in the morning and varies by about a fifth between days; sex hormone binding globulin, which carries most of the total; free or calculated free testosterone, the two or three per cent that is active and that symptoms track; luteinising hormone, which shows whether a low total is the testes not responding or the pituitary not signalling; and the laboratory's own reference range beside each, which differs by assay and against which a forum's number is a different ruler.

Does zinc increase testosterone in men?

Only in a man who is short of it: the register permits the claim that zinc contributes to the maintenance of normal testosterone levels in the blood, which describes a deficient man's total returning to normal at around the 10mg reference value and not a replete man's rising above it, and most men eating meat, dairy and eggs are replete, so zinc moves the first line of the report only when a second test or a restricted diet shows the shortfall; a man taking ten times the reference value has bought the word on the tub, and the levers that move a replete man's lines are body fat, sleep and alcohol.

What causes low testosterone in men?

The report's luteinising hormone line separates the two kinds: a low total with a high signal means the testes are not responding, from causes a doctor investigates, and a low total with a low signal means the pituitary is not sending it, which has its own causes including the energy deficit of a hard cut, obesity, opioid and steroid use and pituitary conditions; outside disease, the levers read off the report are body fat, which lowers the binding globulin and raises conversion to oestrogen, sleep, where five-hour nights cut a young man's total by 10 to 15 per cent, alcohol, which is toxic to the testes and raises clearance, and age, at around one per cent a year from the thirties.

When should a man see a doctor about testosterone?

When the report, two morning samples read against the laboratory's own range, shows the total below range on both days and the man has symptoms, fatigue, low libido, lost strength, low mood or erectile difficulty, because that document describes a diagnosis with causes read from the luteinising hormone line and treatments none of which is on a shelf; and sooner if erectile difficulty is among the symptoms, since it is an early marker of vascular disease years ahead of cardiac events and a reason for a cardiovascular assessment in its own right, whatever the testosterone lines say.

Sources

1. The testosterone measurement guidance: total testosterone is sampled in the morning between about seven and eleven, on two separate days, in a fasted state, because the hormone peaks in the morning, falls through the day, varies day to day and drops after a meal, so that a single afternoon reading or a home kit cannot establish a level or detect a change. PubMed record
2. The testosterone and lifestyle literature: body fat, energy availability, sleep and resistance training are the modifiable determinants of circulating testosterone in men, with weight loss in men with obesity raising levels and prolonged energy deficit lowering them; supplements raise testosterone only where they correct a deficiency, zinc and vitamin D included. PubMed record
3. The vitamin D and testosterone trials: a small trial in overweight men with low vitamin D reported higher testosterone after a year of supplementation, and later randomised trials in men who were not deficient found no change, consistent with a deficiency-correction effect and not a booster effect. PubMed record
4. The GB claims register, zinc entries: zinc contributes to the maintenance of normal testosterone levels in the blood, to normal fertility and reproduction, to normal immune function and to the maintenance of normal skin, hair and nails, among others, at 15% NRV or more. https://www.gov.uk/government/publications/great-britain-nutrition-and-health-claims-nhc-register

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