Kosher supplements

In the UK the most familiar mark is KLBD, the kosher division of the London Beth Din, which certifies companies in dozens of countries. Imported American brands often carry OU or Star-K instead. All are recognised agencies, so the symbol you see depends on where the product was made, not on how strict it is.

Look for the symbol printed on the pack itself. A brand can hold certification for one production site and not another.

Not by itself. Kosher certification is a religious standard about ingredient origin, supervision and equipment. It says nothing about how much of a nutrient the capsule contains, which form that nutrient takes, or how well your body absorbs it.

It does have a useful side effect: certified products tend to declare their carriers and additives clearly, which makes label reading easier. Use the mark to filter, then judge the dose and the form the same way you would for any supplement.

No. A vegan label tells you no animal material was used, but it says nothing about supervision or about the equipment the product ran on. Many vegan labels are self-declared, without an outside inspection.

It works the other way round too. Kosher does not mean vegan: a pareve product may still contain fish or egg, and a dairy-marked product can contain lactose or whey. If both matter to you, combine the two filters rather than relying on one.

Plant cellulose capsules are usually the simplest choice, because the shell question disappears. Tablets are fine but depend on the stearates and coating used. Softgels and liquids need the closest look, since gelatin and glycerin can both be animal-derived.

It can be. Only fish with fins and scales count as kosher, so anchovy and sardine oils qualify, while shellfish-derived oils such as krill do not. The oil must also be processed and bottled under supervision.

The bigger practical hurdle is the shell: most fish oil comes in softgels, which are frequently made with gelatin and glycerin of unclear origin. Look for a certified softgel or an oil in a bottle. You can compare options in our Omega-3 collection.

Vitamin D3 is normally made from lanolin, the grease from sheep's wool, or from fish oil. Both routes can be certified, but that is decided by the agency case by case, looking at the source material and at the equipment used in each chemical step.

Because the production chain is long, D3 is one of the ingredients where a printed symbol matters most. If you would rather avoid animal origin altogether, D3 from lichen is the plant-based alternative.

Rarely, and this catches people out. Collagen is made from animal hides, bones or fish skin. The main certifying agencies require that bovine hides come from cattle slaughtered according to kosher law, which very few collagen suppliers can document.

Fish collagen from kosher fish species is the more realistic route, provided the plant itself is supervised. If you cannot find a certified option, vitamin C and other nutrients that support the body's own collagen formation are worth considering instead.

Rabbinic authorities treat this differently depending on the situation. For someone who is ill, most agencies allow a non-certified product when no equal kosher alternative is available, partly because swallowing a capsule whole is not considered a normal way of eating. For a healthy person taking supplements for general wellbeing, the usual guidance is to choose a certified product.

This is a religious decision rather than a nutritional one, so ask your rabbi. We can tell you what is in the product and what it is certified for.