There are several seeds that can be used to promote hair growth and prevent hair fall. Here are some details about different seeds and their effects on hair:

1. Sesame seeds: Black and white sesame seeds are rich in minerals, vitamins, and fatty acids that give shine and strength to the hair. They can be used in everyday veggies like French beans, stir fries, salads, etc. One tablespoon a day is enough.

2. Fenugreek seeds: Fenugreek seeds are a rich source of iron and protein, which are essential nutrients for hair growth. They also contain a unique composition of plant compounds, including flavonoids and saponins, which are presumed to induce hair growth due to their anti-inflammatory and antifungal effects. A few small human and animal studies suggest that fenugreek seeds may be effective at increasing hair growth, though more research is needed.

3. Black seed oil: Black seed oil contains thymoquinone, a component of the oil that has antioxidant and anti-inflammatory properties. These effects can help create a supportive scalp environment for healthy hair growth. However, much of the research on black seed oils effects on hair growth is preliminary or inconclusive. One study found that black seed oil mixed with coconut oil helped promote hair growth, while another white paper found that hair fallout was reduced.

4. Flaxseed gel: Flaxseed gel is made by cooking or processing flax seeds to release their natural oils. This process results in a thick, gelatinous substance that can help hair grow faster and longer by providing nourishment to the hair follicles. Flaxseed gel is great for defining curls, but it can also help keep straight hair smooth and moisturized. Some say flaxseed gel works wonders for individuals with 4c hair. It can be applied to the hair and scalp as a moisturizer and to help stimulate hair growth.

5. Millet seed oil: Millet seed oil is a good source of micronutrients, such as iron, zinc, and magnesium, which are essential for hair growth. One study found that millet seed oil activates β–catenin signaling and promotes hair growth.

Its important to note that while natural methods like seeds can help maintain the health of your hair, there is no magic potion for hair growth. Good hair growth requires the right nourishment, a balanced diet, and reducing stress.

Regarding product details, positive and negative effects, and ingredients or materials, the search results provide information on natural seeds and oils that can be used to promote hair growth. However, there is no specific product mentioned in the search results. Therefore, we cannot provide details on product-specific information, positive or negative effects, or ingredients or materials.