By Jenny Mills · rural nurse & homesteader · health, safety, law and the paperwork of going bush
“After dosing my nephew too aggressively with a homemade cough syrup, I learned that a teaspoon of honey is not a reliable substitute for precise millilitre measurements.”
No pharmacy runs. No panic. Just straight-up syrup making. Done.
When the power is out and the nearest pharmacy is a long drive away, a small shelf of well-made medicinal syrups covers a surprising amount of ground. Honey-based, glycerin-based, and sugar-based syrups are simple herbal preparations that sit in the middle ground between a quick infusion and a long tincture: they don't take days, and they keep for months.
This article covers how to make them, how to dose them, and when to stop fiddling with a stovetop and call a professional instead.
A syrup is a concentrated water-based extraction of plant material (a decoction or reduction) combined with a preservative — usually sugar, honey, or glycerin. In practice, that means you simmer herbs in water, reduce the liquid down, and then preserve it with a sweetener.
The benefit is the trade-off: compared with fresh infusions (short shelf life) and alcohol tinctures (longer prep, alcohol content), syrups offer a reasonable balance of production time and shelf life, and can be kept for several months depending on storage conditions.
You can also add pre-made liquid concentrates (alcohol, vinegar, honey, or glycerin extracts) directly into a finished syrup, which is useful when you want the preservative qualities of one medium combined with the extraction power of another.
| Parameter | Specification / Guideline |
|---|---|
| Dried herb ratio | 30–100 g dried plant per 1 L water |
| Fresh herb ratio | ~500 g fresh plant per 1 L water |
| Water density (for reduction maths) | ~1 g/mL |
| Glycerin : honey swap | 1:1 by volume |
| Adult dose (general) | ~1 teaspoon or less per 150 lb adult |
| Child dose | Less than adult; scale down by weight |
| Added-sugar ceiling (AHA guidance) | Women ≤6 tsp/day, men ≤9 tsp/day, children 3–6 tsp/day |
| Storage | Cool, dark; refrigerate for longest life |
| Best vessel | Glass bottles/jar with tight lid, sterilised |
Honey brings antibacterial, anti-inflammatory, and antioxidant properties and is famous for soothing sore throats. Raw, unpasteurised honey is preferred for medicinal work because heat processing damages the enzymes and reduces the antibacterial and anti-inflammatory effects.
One well-known folk formula is the honey-and-onion cough syrup: onion provides the antioxidant quercetin, sulfur compounds, and acts as an expectorant to help clear mucus; the honey soothes the throat. Standard method (Rosemary Gladstar's approach): gently warm the honey so the onions release their sulfur compounds, then strain. Onions also contain electrolytes, which help maintain hydration during illness.
Important caveats: honey is not safe for babies under 1 year of age due to infant botulism risk. Honey is also generally unsuitable for diabetics. If you're managing blood sugar, switch the preservative.
Vegetable-sourced glycerin is colourless, odourless, sweet, water-soluble, and is metabolised in the liver, so it doesn't trigger the insulin spikes associated with table sugar. That makes it the standard swap for diabetics, for kids, and for anyone wanting a vegan syrup.
You can replace honey with glycerin in an herbal syrup at a 1:1 ratio by volume.
The catch: large amounts of glycerin can draw water out of the body and increase fluid loss, eventually leading to dehydration. Dose it accordingly — this is a preservative, not a beverage.
Plain sugar works fine and produces the longest-keeping syrups because of the high osmotic pressure. For those avoiding refined sugar, coconut sugar (also called coconut nectar) comes from the sap of the coconut tree and contains 17 amino acids plus minerals and B vitamins — a reasonable upgrade if you're set up to source it.
If you're dosing daily, keep the AHA limits in mind: no more than 6 teaspoons of added sugar per day for women, 9 teaspoons for men, and 3–6 teaspoons for children. A typical adult dose of 1 tsp of syrup can carry a meaningful fraction of that budget.
This is the workflow for a straightforward herb-and-water preparation.
The average dose for most herbal syrups is about a teaspoon or less for a 150-pound adult, with less for children.
A few practical rules:
Syrups can be kept for several months depending on storage. A few points worth knowing:
Home-made medicinal syrups are useful, but they are not a substitute for medical care. Stop self-treatment and contact a licensed health professional if any of the following apply:
If the situation is an emergency — call 000. Off-grid doesn't mean off-network; carry a charged mobile or a UHF radio at minimum.
How long does a homemade medicinal syrup last?
Several months, depending on storage. Cool, dark, refrigerated conditions in sterilised glass extend that window further. Higher sweetener-to-liquid ratios also help.
Can I just swap honey for glycerin?
Yes — glycerin replaces honey in an herbal syrup at a 1:1 ratio. This is the standard swap for diabetics, for vegans, and for anyone avoiding blood-sugar spikes.
Is honey safe for everyone?
No. Honey is not safe for babies under 1 year of age due to infant botulism risk, and diabetics should generally avoid it. Glycerin-based syrups are the usual substitute in both cases.
How much should I take?
A typical adult dose is about a teaspoon or less for a 150-pound adult, with less for children — scaled down by body weight, not by guesswork. Use a proper measuring spoon or an oral syringe.
Do I need to refrigerate the syrup?
Refrigeration extends shelf life significantly and is recommended once the bottle is opened. Unopened, a high-sugar syrup in a cool, dark cupboard will keep for a reasonable period.
What's the difference between a syrup and a tincture?
A tincture uses alcohol (or vinegar) as both the extractant and the preservative, and keeps for years. A syrup uses water for extraction and sugar, honey, or glycerin for preservation, keeps for months, and is generally easier to give to children and to people avoiding alcohol.
Worth a watch: How to Make Homemade Garlic Cough Syrup · Ridge Haven Homestead Off Grid Living