Nervelin Ingredients

Most people meet lysine at dinner rather than in a capsule: it is one of the nine amino acids a human body cannot build for itself, and a chicken breast, a tin of sardines or a bowl of lentils supplies grams of it. The hydrochloride form on this row is the ordinary supplement salt, chosen because it stays dry in a powder. Its clinical file is narrow and old. A 1980 crossover study gave 1,000 mg a day and counted fewer cold sore recurrences; a 1984 trial gave 400 mg three times daily and counted nothing. Cochrane read the field in 2015 and called the evidence insufficient, and a 2023 review of amino-acid upper intakes covers how much is sensible.

The kitchen bottle, dried onto a carrier and pressed into a capsule. The vinegar literature is built on acetic acid delivered as liquid, in volumes a spoon measures: the 2025 meta-analysis of randomised trials in people with type 2 diabetes or excess weight describes an intake near 30 mL a day, an eight-week trial of red wine vinegar improved glucose handling without shifting body fat, and a network comparison of six herbal agents ranked vinegar against its neighbours. A capsule delivers the acid in a fraction of the volume and none of the liquid.

A sour, pumpkin-shaped fruit used as a souring agent in Kerala cooking long before anyone dried the rind for weight-loss capsules. The compound behind the reputation is hydroxycitric acid. The best-known randomised trial put 135 people on 1,500 mg of it a day for twelve weeks and found no separation from placebo on fat mass; a later trial in obese women reported a lipid effect and a crossover study measured appetite directly. This is also the one row on the panel that carries a safety literature of its own: a Drug-Induced Liver Injury Network series, a report that reached acute liver failure, a case that reached transplantation and a 2019 report in the same pattern, with a standing LiverTox chapter and an NCCIH summary. Side effects takes that record in full.

A Southeast Asian root, boiled as a bitter tonic in Malaysia and Indonesia, and the row with the tidiest modern trial record on this panel. The trials that matter used a standardised hot-water root extract and published their amounts: a twelve-week trial at 100 or 200 mg a day, a six-month trial in older men at 200 mg a day, a trial in younger men and a four-week study of stress hormones. Those outcomes are hormonal and psychological rather than neurological. Carry the 100 to 200 mg figure to any label naming this root.

A woodland perennial grown in gardens across Europe and North America as barrenwort, and used in Chinese herbal practice for centuries. Its interesting molecule is icariin, a flavonoid glycoside. A 2024 survey of the genus sets out the chemistry, and a review of icariin describes the enzyme it is proposed to act on. What the literature has never produced is a controlled human trial fixing a daily amount, so no figure appears in this paragraph.

A climbing vine of the American south-east whose tuber gave twentieth-century chemists diosgenin, the starting material they used to manufacture steroid hormones in a factory. That reaction needs laboratory conditions, and a human body does not run it at all, which is the most useful fact about this row and the one most often left out. The one controlled trial tested a wild yam cream against placebo in women with menopausal symptoms and separated from nothing, and a 2024 survey of the genus covers what the plants contain.

Quills of inner bark from a Sri Lankan tree, and the best piece of labelling on the whole panel. Naming Cinnamomum verum distinguishes true cinnamon from the cassia that fills most supermarket jars, and the distinction is chemical rather than cosmetic: a survey that measured both found coumarin content differing by orders of magnitude between them, and the human risk assessment with its absorption study are both written about cassia. On glucose, a 2024 dose-response analysis and the meta-analysis that logged the range put the trials between 120 mg and 6 g a day over four to eighteen weeks, while Cochrane and NCCIH both read the same evidence more coolly.

A ridged green gourd eaten as a vegetable from Kerala to the Philippines, stir-fried with egg or stuffed and braised, and bitter enough that most people meet it as food before they meet it as a supplement. Its research is almost entirely about blood glucose. A three-month trial used 2,000 mg a day and measured insulin secretion, a comparison study set 2 g and 4 g a day against a sulfonylurea, a 2019 pooled analysis collected the trials in which glucose fell, and Cochrane judged the field too thin to recommend. Grams a day is the unit that literature works in.

The aroma compound that makes a raspberry smell like a raspberry, made industrially for flavour and fragrance and sold as a supplement on the strength of laboratory work. The mouse experiment behind it, the fat-cell work and the follow-up in the same cell line are the whole case, and none of the three involved a person. The nearest human study tested a mixed supplement that changed several variables at once, so nothing in its result belongs to the ketones specifically.